A person row a boat 24 km upstream in 4 hours. If the speed of the current is 2 km/h, find the speed of the boat in still water. MCQ with Answer and Explanation
A person row a boat 24 km upstream in 4 hours. If the speed of the current is 2 km/h, find the speed of the boat in still water.
A. 12 km/h
B. 10 km/h
C. 8 km/h
D. 6 km/h
Answer: Option C
Solution (By JKSSB Mock Tests)
Upstream speed = 24 / 4 = 6 km/h. Upstream Speed = Speed in still water - Current speed => 6 = Speed in still water - 2 => Speed in still water = 8 km/h.
Explanation:
Speed of B = 200 / 25 = 8 m/s. Distance covered by B when A crosses the finish line at 22 seconds = 8 * 22 = 176 meters. Winning margin = 200 - 176 = 24 meters.
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