8. Amar cycles to school at a speed of 12 km/h and takes 20 minutes. If he wants
to reach the school within 15 minutes what should be his average speed
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So, 20 minutes is 1/3 hour and at a speed of 12 km/h, Amar can cover 12 * 1/3 = 4 km/h distance. So, his school is at the distance of 4 km. v = 4 / (1/4) = 16 km/h.
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Answer:
12 km/h = 1/3 m/s
20 min. = 1200 sec.
Distance = speed ×time
= 1/3 × 1200
= 400 m
15 min. = 900 sec.
average speed = distance/ time
= 400/900
= 4/8 m/s
4/8 m/s = 18 km/h
reach the school within 15 minutes in 18 km/h
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