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    Question

    Priya travels from station ‘M’ to station ‘N’.

    If she moves at 45 km/h, she reaches 30 minutes early. If she moves at 30 km/h, she reaches 1 hour late. Find the distance between station ‘M’ and station ‘N’.
    A 128 km Correct Answer Incorrect Answer
    B 135 km Correct Answer Incorrect Answer
    C 180 km Correct Answer Incorrect Answer
    D 162 km Correct Answer Incorrect Answer

    Solution

    Let the distance between station ‘M’ and station ‘N’ be ‘d’ km Let the correct time to travel be ‘t’ hours According to the question, (d/30) = t + 1 And, (d/45) = t - 0.5 Or, (d/30) - (d/45) = 1 + 0.5 = 1.5 Or, (3d - 2d) ÷ 90 = 1.5 Or, d = 1.5 × 90 = 135 Therefore, distance between station ‘M’ and station ‘N’ is 135 km.

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