River current

In a river, a man takes 3 hours in rowing 3 km upstream or 15 km downstream. What is the speed of the current?

Correct answer:

v =  2 km

Step-by-step explanation:

t=3 h s1=3 km s2=15 km  v1=s1/t=3/3=1 km/h v2=s2/t=15/3=5 km/h  v1 = vv0 v2 = v+v0  v=2v1+v2=21+5=3 km/h  v0=vv1=31

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