Question

A person can row `7 1/2` km an hour in still water and he finds that it takes him twice as long to row up as to row down the river. The speed of the stream is:

विकल्प

• 2 km/hr

• 3 km/hr

• `2 1/2` km/hr

• `3 1/2` km/hr

Answer 1

`2 1/2` km/hr

Explanation:

x : y

36 : 5

(36 – 5) t = (36 + 5) × 310 m

t = 410 m = 6 h 50 m