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How many seconds will a boy take to run one complete round around a square field of side 87 metres, if he runs at a speed of 3 km/h?

A417.6

B424

C425

D421

Answer:

A. 417.6

Read Explanation:

Distance = perimeter of square = 4a = 4 × 87 = 348 Time = distance/speed =348/{3 × 5/18} =348 × 18/{3 × 5} = 417.6


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