Programa para encontrar Longitud de Puente usando Velocidad y Longitud de Tren

Dada la longitud y la velocidad del tren y el tiempo que tarda el tren en pasar el puente o el túnel, la tarea es encontrar la longitud del puente.
Ejemplos: 
 

Entrada : longitud del tren = 120 metros, Velocidad = 30 m/seg, tiempo = 18 s 
Salida : longitud del puente = 420 metros.
Entrada : longitud del tren = 130 metros, Velocidad = 25 m/seg, tiempo = 21 s 
Salida : longitud del puente = 395 metros. 
 

Aproximación: 
Sea la longitud del puente  . 
Como se sabe que Velocidad = Distancia / Tiempo 
Por lo tanto: 
 

Distancia total = (longitud del tren + longitud del puente) 
=> Velocidad del tren = (longitud del tren + x) / Tiempo. 
=> x = (Velocidad del tren * tiempo) – Longitud del tren.

Fórmula: 
 

longitud del puente = (velocidad del tren * tiempo necesario para cruzar el puente) – longitud del tren.

A continuación se muestra la implementación del enfoque anterior: 
 

// C++ Program to implement above code.
 
#include <bits/stdc++.h>
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 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 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# 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

<?php
// PHP 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
$trainLength = 120;
$Speed = 30;
$Time = 18;
 
echo "Length of bridge = ".
    bridge_length($trainLength,
                  $Speed, $Time).
                       " meters";
 
// This code is contributed by Raj
?>

<script>
 
// 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
    
</script>

Length of bridge = 420 meters

Complejidad Temporal: O(1)
Espacio Auxiliar: O(1), ya que no se ha tomado ningún espacio extra.