Question

    In a 10 km race, D, E, and F are running at uniform speed.

    If ‘D’ beats ‘E’ by 2 km, and ‘E’ beats ‘F’ by 1 km, then by how many metres does ‘D’ beat ‘F’?
    A 1200 m Correct Answer Incorrect Answer
    B 2550 m Correct Answer Incorrect Answer
    C 2800 m Correct Answer Incorrect Answer
    D 37400 m Correct Answer Incorrect Answer

    Solution

    ATQ,

    When ‘D’ covers 10 km, ‘E’ will cover 8 km

    Similarly, when ‘E’ covers 10 km, ‘F’ covers 9 km

    Therefore, when ‘E’ covers 8 km, then ‘F’ will cover = (8 × 9) / 10 = 7.2 km

    Therefore, ‘D’ will beat ‘F’ by = 10 – 7.2 = 2.8 km = 2800 metres

    Practice Next