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A boat covers 48 km downstream in 20 h. What is the speed of the boat if it takes 4 h more to cover the same distance against the stream?1. 4.4 km/hr2. 2 km/hr3. 3.4 km/hr4. 2.2 km/hr5. 4 km/hr

Answer» Correct Answer - Option 4 : 2.2 km/hr

Given:

Distance = 48 km

Downstream Time = 20 h

Upstream Time = 4 hrs more than Downstream

Formula Used:

Speed of boat in still water = ½ (Speed Downstream + Speed of Upstream)

Calculations:

Speed of Downstream = 48/20 = 2.4 km/h

Speed of Upstream = 48/24 = 2 km/h

∴ Speed of boat in still water = ½ (Speed Downstream + Speed of Upstream)

⇒ (1/2) × (2.4 + 2)

⇒ (1/2) × 4.4

⇒ 2.2 km/h

The speed of the boat is 2.2 km/h.



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