Program to convert speed in km/hr to m/sec and vice versa

Convert speed given in km/hr to m/sec and vice versa.

Examples: 

Input : kmph = 72, mps = 10
Output : speed_in_mps = 20
         speed_in_kmph = 36 

Input : kmph = 54, mps = 15
Output : speed_in_mps = 15
         speed_in_kmph = 54 

Approach:

1 km = 1000 m and 1 hr = 3600 sec (60 min x 60 sec each). 
Conversion from Km/h to m/sec- 
When converting km/hr to m/sec, multiply the speed with 1000 and divide the result with 3600. 

1 km/hr = 5/18 m/sec or 0.277778 m/sec 

Conversion from m/sec to km/h- 
When Converting m/sec to km/hr, divide the speed by 1000 and multiply the result by 3600. 

1 m/sec = 18/5 km/hr or 3.6 km/hr

Below is the program implementation: 

C++

// CPP program to convert
// kmph to mps and vice versa
#include <bits/stdc++.h>
using namespace std;

// function to convert speed
// in km/hr to m/sec
float kmph_to_mps(float kmph)
{
    return (0.277778 * kmph);
}

// function to convert speed
// in m/sec to km/hr
float mps_to_kmph(float mps)
{
    return (3.6 * mps);
}

// driver function
int main()
{
    // variable to store
    // speed in kmph
    float kmph = 72.0;

    // variable to store
    // speed in mps
    float mps = 10.0;

    cout << "speed_in_mps = " << kmph_to_mps(kmph)
         << " speed_in_kmph = " << mps_to_kmph(mps);

    return 0;
}

Java

// Java program to convert
// kmph to mps and vice versa
import java.io.*;

class GFG
{
    // function to convert speed
    // in km/hr to m/sec
    static int kmph_to_mps(double kmph)
    {
        return(int) (0.277778 * kmph);
    }

    // function to convert speed
    // in m/sec to km/hr
    static int mps_to_kmph(double mps)
    {
        return(int) (3.6 * mps);
    }

    // Driver function
    public static void main (String[] args)
    {
        // variable to store
        // speed in kmph
        double kmph = 72.0;

        // variable to store
        // speed in mps
        double mps = 10.0;

        System.out.println("speed_in_mps = " + kmph_to_mps(kmph)
                          + " speed_in_kmph = " +mps_to_kmph(mps));

    }
}

// This code is contributed by vt_m.

Python3

# Python3 program to convert
# kmph to mps and vice versa

# Function to convert speed
# in km/hr to m/sec
def kmph_to_mps(kmph):

    return (0.277778 * kmph)

# Function to convert speed
# in m/sec to km/hr
def mps_to_kmph(mps):

    return (3.6 * mps)

# Driver Code

# variable to store
# speed in kmph
kmph = 72.0

# variable to store
# speed in mps
mps = 10.0

print("speed_in_mps = ", int(kmph_to_mps(kmph)) ,
      " speed_in_kmph = ", int(mps_to_kmph(mps)))

# This code is contributed by Anant Agarwal.

C#

// C# program to convert
// kmph to mps and vice versa
using System;

class GFG {

    // function to convert speed
    // in km/hr to m/sec
    static int kmph_to_mps(double kmph)
    {
        return (int)(0.277778 * kmph);
    }

    // function to convert speed
    // in m/sec to km/hr
    static int mps_to_kmph(double mps)
    {
        return (int)(3.6 * mps);
    }

    // Driver function
    public static void Main()
    {
        // variable to store
        // speed in kmph
        double kmph = 72.0;

        // variable to store
        // speed in mps
        double mps = 10.0;

        Console.WriteLine("speed_in_mps = " + kmph_to_mps(kmph) +
                        " speed_in_kmph = " + mps_to_kmph(mps));
    }
}

// This code is contributed by vt_m.

PHP

<?php
// PHP program to convert
// kmph to mps and vice versa

    // function to convert speed
    // in km/hr to m/sec
    function kmph_to_mps($kmph)
    {
        return floor(0.277778 * $kmph);
    }

    // function to convert speed
    // in m/sec to km/hr
    function mps_to_kmph( $mps)
    {
        return (3.6 * $mps);
    }

    // Driver Code
    // variable to store
    // speed in kmph
    $kmph = 72.0;

    // variable to store
    // speed in mps
    $mps = 10.0;

    echo "speed_in_mps = " ,
          kmph_to_mps($kmph)
          ," speed_in_kmph = " ,
          mps_to_kmph($mps);

// This code is contributed by anuj_67.
?>

Javascript

<script>

// javascript program to convert
// kmph to mps and vice versa

// Function to convert speed
// in km/hr to m/sec
function kmph_to_mps(kmph)
{
    return (0.277778 * kmph);
}

// Function to convert speed
// in m/sec to km/hr

function mps_to_kmph(mps)
{
    return (3.6 * mps) ;
}

// Driver Code

// variable to store
// speed in kmph
var kmph = 72.0

// variable to store
// speed in mps
var mps = 10.0

document.write("speed_in_mps = " +  Number(kmph_to_mps(kmph).toFixed(0)) +
      " speed_in_kmph = " + Number(mps_to_kmph(mps).toFixed(0)))

      // This code is contributed by bunnyram19.
</script>

Output

speed_in_mps = 20 speed_in_kmph = 36

Time Complexity: O(1) 
Auxiliary Space: O(1)