The ship

The ship went at the upstream speed of 20 km/h in relation to water. The river flows at a speed of 10 km/h. After half an hour, he stopped and returned downstream to the starting point. How long does it take back when even if the downstream speed of the ship is 20 km/h concerning water?

Correct answer:

t =  10 min

Step-by-step explanation:


(20-10)·30 = (20+10)·t

30t = 300


t = 300/30 = 10

t = 10

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