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    Question

    Two cars start from a place with a speed of 35 km/hr at

    an interval of 10 minutes. What is the speed of a man coming from the opposite direction towards the place if he meets the cars at an interval of 7 minutes?
    A 12 km/hr Correct Answer Incorrect Answer
    B 20 km/hr Correct Answer Incorrect Answer
    C 15 km/hr Correct Answer Incorrect Answer
    D 5 km/hr Correct Answer Incorrect Answer
    E 10 km/hr Correct Answer Incorrect Answer

    Solution

    Distance covered in 10 minutes at 35 km/hr =35 x (10/60) Distance covered in 7 minutes at (35 + x) km/hr = (7/60) x (35 + x) Now, Distance covered in 10 minutes at 35 km/hr = Distance covered in 7 minutes at (35 + x) km/hr ⇒ 35 x (10/60) = (7/60) x (35 + x) ⇒ 35 x 10 = 245 + 7x ⇒ 350 = 245 + 7x ⇒ 7x = 350 - 245 = 105 ⇒ x = 15 km/hr

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