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.

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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.

A20 km/hr

B32 km/hr

C16 km/hr

D18 km/hr

Answer:

A. 20 km/hr

Read Explanation:

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

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