A boat

A boat covers 20 km in an hour with down stream and covers the same distance in 2 h with upstream. Then, find the speed of the boat in still water and speed of 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 = vs  v1 = (v2+s)+s v1 = v2+2s  s=(v1v2)/2=(2010)/2=5 km/h  v=v1s=205=15 km/h



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