A boat

A boat covers 20 km in an hour downstream and covers the same distance in 2 hours upstream. Then, find the speed of the boat in still water and the speed of the stream.

Correct answer:

v =  15 km/h
s =  5 km/h

Step-by-step explanation:

L=20 km t1​=1 h t2​=2 h  v1​=L/t1​=20/1=20 km/h v2​=L/t2​=20/2=10 km/h  v1​ = v+s v2​ = v−s  v1​ = (v2​+s)+s v1​ = v2​+2s  s=(v1​−v2​)/2=(20−10)/2=5 km/h  v=v1​−s=20−5=15 km/h

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