# 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.

 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)

Output:

1.25  Km/hr

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