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?A417.6B424C425D421Answer: A. 417.6 Read Explanation: Distance = perimeter of square = 4a = 4 × 87 = 348 Time = distance/speed =348/{3 × 5/18} =348 × 18/{3 × 5} = 417.6Read more in App