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A man can row 7 (1/2) km/h in still water. If in a river running at 1.5 km an hour it takes him 50 minutes to row to a place and back, how far off is the place?

Answer»

Answer:

DISTANCE is 3 km

Step-by-step EXPLANATION:

Speed Downstream = (7.5 + 1.5) kmph = 9 kmph

Speed Upstream = (7.5 - 1.5) kmph = 6 kmph

Let the REQUIRED distance be x km. Then,

x/9 + x/6 = 50/60

2x + 3x = 5/6 × 18 = 5X = 15, x = 3

Hence the required distance is 3 km.

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