How many seconds will a boy take to run one complete round around a square field of side 78 metres, if he runs at a speed of 13 km/h?
86.4
To find the time taken, first calculate the perimeter of the square: - Perimeter = 4 × 78 = 312 metres. - Convert the speed into metres per second: 13 km/h = 13 × 1000 / 3600 = 13/3 m/s. - Time = Distance / Speed = 312 / (13/3) = 312 × 3 / 13 = 86.4 seconds.
Important Questions from Speed Time and Distance
A train travelling at a speed of 72 km/hr crosses a post in 20 seconds. If it crosses another train travelling at a speed of 54 km/hr in the same direction in 1 minute 45 seconds, then the difference in length between the two trains is
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