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    Question

    ‘C’ and ‘D’ are going from place ‘M’ to

    place ‘N’, which is 1200 km apart. If ‘C’ started 4 hours after ‘D’ but both of them reached ‘N’ at the same time, then find the speed of ‘D’. The difference between their speeds is 20 km/hr.
    A 55 km/hr Correct Answer Incorrect Answer
    B 60 km/hr Correct Answer Incorrect Answer
    C 65 km/hr Correct Answer Incorrect Answer
    D 75 km/hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Let the speed of ‘C’ be ‘y’ km/hr Therefore, speed of ‘D’ = (y – 20) km/hr According to the question, Since speed cannot be negative therefore, y = 80 Therefore, speed of ‘D’ = y - 20 = 60 km/hr

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