Question

A boat covers 36 km upstream in 2 hours and 66 km downstream in 3 hours. Find the speed of the boat in still water.

• A. 20 km/hr
• B. 32 km/hr
• C. 16 km/hr
• D. 18 km/hr

Answer 1

Answer:

A. 20 km/hr

When boat goes upstream x – y = 36/2= 18 km/hr –-– (i) When boat goes downstream x + y = 66/3 = 22 km/hr ––– (ii) By adding eq (i) and (ii) ⇒ 2x = 40 ⇒ x = 20 km/hr