a boy runs for 20min. at a uniform speed of 18km/h.at what speed should he run for the next 40 min. so that the average speed comes 24km/hr.
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Non uniform speed I think
vinit45:
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Time = 20min
Speed = 18km/h = 18 × 5/18 = 5m/s
Distance = Speed × time
Distance = 5 ×20 = 100
24×5/18 = 20/3
Distance = 40 × 20/3
= 800/3.
Speed = 18km/h = 18 × 5/18 = 5m/s
Distance = Speed × time
Distance = 5 ×20 = 100
24×5/18 = 20/3
Distance = 40 × 20/3
= 800/3.
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