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​ = v−v0​ v2​ = v+v0​  v=2v1​+v2​​=21+5​=3 km/h  v0​=v−v1​=3−1

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You need to know the following knowledge to solve this word math problem:

algebraarithmeticUnits of physical quantitiesthemes, topics

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