A man can row 5 km h in still water If the speed of the current is 1 km h it takes 3h more in upstre...........

Quant (SSC) Boats and Streams

A man can row 5 km/h in still water. If the speed of the current is 1 km/h, it takes 3h more in upstream than in the downstream for the same distance. The distance is:

36 km

24 km

20 km

32 km

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Explanation:

A man can row x kmph in still waters. If the river is running at y kmph, it takes T hrs more in upstream then to go downstream for the same distance, then the distance is given
by [(x²- y²)T /2y] km
By the short trick approach, we get
= [(5² – 1²) × 3 /2 x 1] km
= 72 /2 = 36 km