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Find the speed of the stream from the speed of the man given in both upstream and downstream
  • Last Updated : 08 Apr, 2021

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.

Speed = \frac{distance}{time}

  • Then, calculate the speed of the stream. It is given by the formula –

Rate of Stream = \frac{1}{2}(downstream - upstream)

Below is the implementation. 



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>

Output:

1.25  Km/hr

 

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