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    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?
    A 2.25 hrs Correct Answer Incorrect Answer
    B 5.49 hrs Correct Answer Incorrect Answer
    C 9.44 hrs Correct Answer Incorrect Answer
    D 10.25 hrs Correct Answer Incorrect Answer

    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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