Water current speed.

Two cities along the river are 100 km apart. The powerboat downstream runs for 4 hours, upstream for 10 hours. Determines the river's current speed.

Correct answer:

v =  7.5 km/h

Step-by-step explanation:

s=100 km t1=4 h t2=10 h  v1=s/t1=100/4=25 km/h v2=s/t2=100/10=10 km/h  v1 = a+v v2 = av  v1  v2 = 2v  v=2v1v2=22510=7.5 km/h



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