import java.io.*;
import java.util.*;
import java.math.*;

class HighwayCrossing {
    public static void main(String args[]) {
        try {
            InputReader in = new InputReader(System.in);
            BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
            int tc = in.readInt();
            for (int t = 0; t < tc; t++) {
                int n = in.readInt();
                int s = in.readInt();
                int y = in.readInt();
                int v[] = new int[n];
                int d[] = new int[n];
                double p[] = new double[n];
                int c[] = new int[n];
                for (int i = 0; i < n; i++) {
                    v[i] = in.readInt();
                }
                for (int i = 0; i < n; i++) {
                    d[i] = in.readInt();
                }
                for (int i = 0; i < n; i++) {
                    p[i] = in.readDouble();
                }
                for (int i = 0; i < n; i++) {
                    c[i] = in.readInt();
                }
                double time = 0.0d;
                double eps = 1e-6;
                //time to cross lane by Chef
                double timeToCrossLane = (double)y / s;
                for (int i = 0; i < n; i++) {
                    double prevTime = time;
                    double timeLane = prevTime + (double)y / s;
                    // if car is going down the y axis
                    if (d[i] == 0) {
                        //cordinate of ith car(end point) when chef reached the divider before it
                        double cordPrevTime = (p[i] + c[i]) - (prevTime * v[i]);
                        // coordinate of ith car(end point) when chef will reach the next divider
                        double cordTimeLane = cordPrevTime - (timeToCrossLane * v[i]);
                        // if end point was above y = 0 and after timeToCrossLane time
                        // it is below y = 0, that means collision will occur
                        // or car is over y = 0, after timeToCrossLane time, means again collision will
                        // occur.
                        if (((cordPrevTime) >= eps) && (Math.abs(cordTimeLane) <= eps || cordTimeLane <= eps) || ((cordTimeLane >= eps) && (cordTimeLane - c[i]) <= eps)) {
                            timeLane = prevTime + (Math.abs(cordPrevTime) / v[i]);
                            timeLane += (double)y / s;
                            time = timeLane;
                        }
                        else {
                            time = timeLane;
                        }
                    }
                    else {
                        //same as above
                        double cordPrevTime = (p[i] - c[i]) + (prevTime * v[i]);
                        double cordTimeLane = cordPrevTime + (timeToCrossLane * v[i]);
                        if (((cordPrevTime <= -eps) && (Math.abs(cordTimeLane) <= eps || cordTimeLane >= eps) || ((cordTimeLane) <= eps) && (cordTimeLane + c[i]) >= -eps)) {
                            timeLane = prevTime + (Math.abs(cordPrevTime) / v[i]);
                            timeLane += (double)y / s;
                            time = timeLane;
                        }
                        else {
                            time = timeLane;
                        }
                    }
                }
                System.out.printf("%.3f\n", time);
            }
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
class InputReader {
    private boolean finished = false;

    private InputStream stream;
    private byte[] buf = new byte[1024];
    private int curChar;
    private int numChars;

    public InputReader(InputStream stream) {
        this.stream = stream;
    }

    public int read() {
        if (numChars == -1)
            throw new InputMismatchException();
        if (curChar >= numChars) {
            curChar = 0;
            try {
                numChars = stream.read(buf);
            } catch (IOException e) {
                throw new InputMismatchException();
            }
            if (numChars <= 0)
                return -1;
        }
        return buf[curChar++];
    }

    public int peek() {
        if (numChars == -1)
            return -1;
        if (curChar >= numChars) {
            curChar = 0;
            try {
                numChars = stream.read(buf);
            } catch (IOException e) {
                return -1;
            }
            if (numChars <= 0)
                return -1;
        }
        return buf[curChar];
    }

    public int readInt() {
        int c = read();
        while (isSpaceChar(c))
            c = read();
        int sgn = 1;
        if (c == '-') {
            sgn = -1;
            c = read();
        }
        int res = 0;
        do {
            if (c < '0' || c > '9')
                throw new InputMismatchException();
            res *= 10;
            res += c - '0';
            c = read();
        } while (!isSpaceChar(c));
        return res * sgn;
    }

    public long readLong() {
        int c = read();
        while (isSpaceChar(c))
            c = read();
        int sgn = 1;
        if (c == '-') {
            sgn = -1;
            c = read();
        }
        long res = 0;
        do {
            if (c < '0' || c > '9')
                throw new InputMismatchException();
            res *= 10;
            res += c - '0';
            c = read();
        } while (!isSpaceChar(c));
        return res * sgn;
    }

    public String readString() {
        int length = readInt();
        if (length < 0)
            return null;
        byte[] bytes = new byte[length];
        for (int i = 0; i < length; i++)
            bytes[i] = (byte) read();
        try {
            return new String(bytes, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            return new String(bytes);
        }
    }

    public static boolean isSpaceChar(int c) {
        return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
    }

    private String readLine0() {
        StringBuffer buf = new StringBuffer();
        int c = read();
        while (c != '\n' && c != -1) {
            if (c != '\r')
                buf.appendCodePoint(c);
            c = read();
        }
        return buf.toString();
    }

    public String readLine() {
        String s = readLine0();
        while (s.trim().length() == 0)
            s = readLine0();
        return s;
    }

    public String readLine(boolean ignoreEmptyLines) {
        if (ignoreEmptyLines)
            return readLine();
        else
            return readLine0();
    }

    public BigInteger readBigInteger() {
        try {
            return new BigInteger(readString());
        } catch (NumberFormatException e) {
            throw new InputMismatchException();
        }
    }

    public char readCharacter() {
        int c = read();
        while (isSpaceChar(c))
            c = read();
        return (char) c;
    }

    public double readDouble() {
        int c = read();
        while (isSpaceChar(c))
            c = read();
        int sgn = 1;
        if (c == '-') {
            sgn = -1;
            c = read();
        }
        double res = 0;
        while (!isSpaceChar(c) && c != '.') {
            if (c == 'e' || c == 'E')
                return res * Math.pow(10, readInt());
            if (c < '0' || c > '9')
                throw new InputMismatchException();
            res *= 10;
            res += c - '0';
            c = read();
        }
        if (c == '.') {
            c = read();
            double m = 1;
            while (!isSpaceChar(c)) {
                if (c == 'e' || c == 'E')
                    return res * Math.pow(10, readInt());
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                m /= 10;
                res += (c - '0') * m;
                c = read();
            }
        }
        return res * sgn;
    }

    public boolean isExhausted() {
        int value;
        while (isSpaceChar(value = peek()) && value != -1)
            read();
        return value == -1;
    }

    public String next() {
        return readString();
    }

    public boolean readBoolean() {
        return readInt() == 1;
    }
}