A train is moving at a speed of 100km/hr. It takes 18mins to reach a station. What should be it's speed if the train wants to reach the station in 15 minutes?
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case 1
time = 18min = 18/60 hr
distance= speed×time = 100×18/60 = 30km
we have cover 30km in just 15mins = 15/60hr= 1/4
speed= distance/time = 30/ 1/4 = 120km/hr
the speed should be 120km/hr to cover 30kmin 15mins
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