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Q.
How long will a boy take to run round a square field of side 35 meters, If he runs at the rate of 9 km/hr?
A.
50 sec
B.
52 sec
C.
54 sec
D.
56 sec
View Answer
Correct choice: D
Explanation:
Speed = 9 km/hr = 9 x (5/18) m/sec = 5/2 m/sec Distance = (35 x 4) m = 140 m. Time taken = 140 x (2/5) sec= 56 sec
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