The speed of a boat in downstream and upstream is 30 km/hr and 22 km/hr, respectively. Find the approximate time taken by the boat to cover a distance of 160 km in still water.
ATQ,
Let the speed of the boat in still water be x km/hr and the speed of the stream be y km/hr. According to the given conditions, 
Adding equations (I) and (II),
So, the speed of the boat in still water is 26 km/hr. The required time taken = (160/26) ≈ 6.15hours. or 7 hours
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