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    Question

    Pipe 'R' and 'S' can fill a tank in 40 minutes and 1

    hour respectively. 'R' is opened alone. After 16 minutes, 'R' is closed and 'S' is opened. Find the time taken by 'S' to fill the remaining tank.
    A 30 minutes Correct Answer Incorrect Answer
    B 32 minutes Correct Answer Incorrect Answer
    C 36 minutes Correct Answer Incorrect Answer
    D 40 minutes Correct Answer Incorrect Answer
    E 44 minutes Correct Answer Incorrect Answer

    Solution

    Let the total capacity of tank be 120 litres (LCM of 40 and 60) Efficiency of 'R' = (120/40) = 3 litres/minute Efficiency of 'S' = (120/60) = 2 litres/minute Tank filled by 'R' = 3 ├Ч 16 = 48 litres Remaining part of the tank = 120 тИТ 48 = 72 litres Required time = (72/2) = 36 minutes

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