Question

4. A man rows his boat 85 km downstream and 45 km

upstream, taking 2.30 hours each time. Find the

speed of the stream ?
(A) 5 kmph
(B) 6 kmph
(C) 7 kmph
(D) 8 kmph​

Answer 1

Answer:

Option D

Explanation:

Speed downstream = d/t = 85/(2 1/2) = 34 kmph

Speed upstream = d/t = 45/(2 1/2) = 18 kmph

The speed of the stream = (34 - 18)/2 = 8 kmph