A boy runs 20 minwith a uniform speed of 18 km /h at what speed should he run for 40 min so average speed becomes 24km/h?
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Total time = 40 +20 min
= 1 hr
Avg. Speed = 24 km/h
Distance = 24 × 1 km
= 24 km
Distance(for 20min running) = 6 km
Distance(for 40min running) = 24-6 km = 18km
Speed(for 40min running) = 27 km/h
= 1 hr
Avg. Speed = 24 km/h
Distance = 24 × 1 km
= 24 km
Distance(for 20min running) = 6 km
Distance(for 40min running) = 24-6 km = 18km
Speed(for 40min running) = 27 km/h
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