Rajasthan Police Constable Model Paper 9

Question : 55 of 150

Marks: +1, -0

Umesh goes 14 km downstream in 1 hour and returns in 2 hours. Find the speed of the boat in still water.

Solution:

Downstream speed

S_d

14/1

= 14km/hr
Upstream speed

S_u

14/2

= 7 km/hr
∴ Speed of boat in still water = (Sd + Su) ÷ 2 = (14 + 7) ÷ 2 = 10.5 km/hr

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