Question
A train takes 3 hours to travel a certain distance at a
speed of 60 km/h. If the speed is increased by 20 km/h, how long will it take to cover the same distance?Solution
ATQ, Time = Distance / Speed Initial time = 3 hours Initial speed = 60 km/h Final speed = 80 km/h Since the distance is constant, the time and speed are inversely proportional. Initial time × Initial speed = Final time × Final speed 3 hours × 60 km/h = Final time × 80 km/h Final time = (3 hours × 60 km/h) / 80 km/h = 2.25 hours
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