程序使用速度和火车长度来查找桥的长度

给定火车的长度和速度，以及火车通过桥梁或隧道所花费的时间，任务是找到桥梁的长度。
例子：

Input : length of train = 120 meters, Speed = 30 m/sec, time = 18 sec 
Output : length of bridge = 420 meters.
Input : length of train = 130 meters, Speed = 25 m/sec, time = 21 sec 
Output : length of bridge = 395 meters. 
 

方法：
设桥的长度为$x$ 。
众所周知，速度=距离/时间
所以：

Total distance = (length of train + length of bridge) 
=> Speed of train = (length of train + x) / Time. 
=> x = (Speed of train * time) – Length of train.

公式：

length of bridge = (speed of train * time taken to cross bridge) – length of train.

下面是上述方法的实现：

C++

// C++ Program to implement above code.
 
#include 
using namespace std;
 
// function to calculate the length of bridge.
int bridge_length(int trainLength, int Speed, int Time)
{
    return ((Time * Speed) - trainLength);
}
 
// Driver Code
int main()
{
    // Assuming the input variables
    int trainLength = 120;
    int Speed = 30;
    int Time = 18;
 
    cout << "Length of bridge = "
         << bridge_length(trainLength, Speed, Time)
         << " meters";
 
    return 0;
}

Java

//Java Program to implement above code.
 
public class GFG {
     
    //function to calculate the length of bridge.
    static int bridge_length(int trainLength,
                            int Speed, int Time)
    {
    return ((Time * Speed) - trainLength);
    }
 
    //Driver Code
    public static void main(String[] args) {
         
        // Assuming the input variables
        int trainLength = 120;
        int Speed = 30;
        int Time = 18;
 
        System.out.print("Length of bridge = "+
            bridge_length(trainLength, Speed,Time)
            +" meters");
    }
}

Python 3

# Python 3 Program to implement above code.
 
# function to calculate the length of bridge.
def bridge_length(trainLength, Speed, Time) :
 
    return ((Time * Speed) - trainLength)
     
# Driver Code
if __name__ == "__main__" :
 
    # Assuming the input variables
    trainLength = 120
    Speed = 30
    Time = 18
 
    print("Length of bridge = ",bridge_length
            (trainLength, Speed, Time),"meters")
 
# This code is contributed by ANKITRAI1

C#

// C# Program to implement above code
using System;
 
class GFG
{
 
// function to calculate
// the length of bridge
static int bridge_length(int trainLength,
                         int Speed, int Time)
{
    return ((Time * Speed) - trainLength);
}
 
// Driver Code
static void Main()
{
    // Assuming the input variables
    int trainLength = 120;
    int Speed = 30;
    int Time = 18;
 
        Console.Write("Length of bridge = " +
        bridge_length(trainLength, Speed, Time) +
                                      " meters");
}
}
 
// This code is contributed by Raj

Javascript

 
// Javascript program to implement above code.
 
// Function to calculate the length of bridge.
function bridge_length(trainLength, Speed, Time)
{
    return ((Time * Speed) - trainLength);
}
 
// Driver code
 
// Assuming the input variables
var trainLength = 120;
var Speed = 30;
var Time = 18;
 
document.write("Length of bridge = " +
   bridge_length(trainLength, Speed,Time) +
   " meters");
 
// This code is contributed by Khushboogoyal499
    

输出：

Length of bridge = 420 meters

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