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    Question

    In a 400-metre race, β€˜A’ beats β€˜B’ by 20 seconds

    or 80 metres. Find the time taken by β€˜B’ to finish the race.
    A 40 seconds Correct Answer Incorrect Answer
    B 90 seconds Correct Answer Incorrect Answer
    C 100 seconds Correct Answer Incorrect Answer
    D 50 seconds Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of β€˜B’ = (80/20) = 4 m/s Time taken by β€˜B’ to finish the race = 400 Γ· 4 = 100 seconds

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