A boy swims 200 m in still water and then returns back to the point of start in total 10 minutes. Find the speed of his swim in kmph.
A
0.66 kmph
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B
2.1 kmph
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C
1.5 kmph
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D
2.4 kmph
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Solution
The correct option is D 2.4 kmph A boy swims 200 m in still water and then returns back to the starting point in total 10 minutes
Distance = 200 m + 200 m = 400 m
Time = 10 minutes = 600 seconds
speed = 400600=46=23 m/s
Converting m/s to km/hr
speed = 23×185=3615=2.4 kmph