Find the speed of the stream from the speed of the man given in both upstream and downstream
A boat takes N1 hr to row a bot X1 km downstream of a river and take N2 hr to cover a distance of X2 km upstream. Find the speed of the stream.
Input: 3 15 2 5 Output: 17.5 km/hr Input: 4 29 7 30 Output: 47 km/hr
Approach:
- Take input from users
- Calculate the rate of downstream and upstream. The rate can be calculated using the formula.
- Then, calculate the speed of the stream. It is given by the formula –
Below is the implementation.
C++
#include<iostream> using namespace std; void rate( float down, float up) { // Stream rate float rate = 0.5 * (down - up); cout << rate << " Km/hr" ; } // Driver Code int main() { // Distance and time downstream float N1 = 3; float X1 = 15; // Distance and time upstream float N2 = 2; float X2 = 5; // Rate of downstream and upstream float Rate_downstream = X1 / N1; float Rate_upstream = X2 / N2; rate(Rate_downstream, Rate_upstream); return 0; } // This code is contributed by Surbhi Tyagi. |
Java
/*package whatever //do not write package name here */ import java.io.*; public class GFG { public static void rate( float down, float up) { // Stream rate double rate = 0.5 * (down - up); System.out.println(rate+ " Km/hr" ); } // Driver Code public static void main(String args[]) { // Distance and time downstream float N1 = 3 ; float X1 = 15 ; // Distance and time upstream float N2 = 2 ; float X2 = 5 ; // Rate of downstream and upstream float Rate_downstream = X1 / N1; float Rate_upstream = X2 / N2; rate(Rate_downstream, Rate_upstream); } } // This code is contributed by sravankumar8128. |
Python3
def rate(down, up): # stream rate rate = 0.5 * (down - up) print (rate, " Km/hr" ) # Driver Code # Distance and time downstream N1 = 3 X1 = 15 # Distance and time upstream N2 = 2 X2 = 5 # Rate of downstream and upstream Rate_downstream = X1 / N1 Rate_upstream = X2 / N2 rate(Rate_downstream, Rate_upstream) |
Javascript
<script> function rate(down, up) { // Stream rate var rate = 0.5 * (down - up); document.write(rate, " Km/hr" ); } // Driver Code // Distance and time downstream var N1 = 3; var X1 = 15; // Distance and time upstream var N2 = 2; var X2 = 5; // Rate of downstream and upstream var Rate_downstream = X1 / N1; var Rate_upstream = X2 / N2; rate(Rate_downstream, Rate_upstream); // This code is contributed by Ankita saini </script> |
C#
// C# program for the above approach using System; class GFG { static double rate( float down, float up) { // Stream rate double rate = 0.5 * (down - up); return rate; } // Driver Code public static void Main() { // Distance and time downstream float N1 = 3; float X1 = 15; // Distance and time upstream float N2 = 2; float X2 = 5; // Rate of downstream and upstream float Rate_downstream = X1 / N1; float Rate_upstream = X2 / N2; Console.WriteLine( rate(Rate_downstream, Rate_upstream) + " Km/hr" ); } } // This code is contributed by Palak Gupta |
Output:
1.25 Km/hr
Time Complexity: O(1)
Auxiliary Space: O(1)
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