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    Question

    A cylindrical tank of radius 7 meters and height 10

    meters is filled with water. Water is pumped out at the rate of 50 cubic meters per minute. How long will it take to empty the tank completely?
    A 31 minutes Correct Answer Incorrect Answer
    B 28 minutes Correct Answer Incorrect Answer
    C 25 minutes Correct Answer Incorrect Answer
    D 20 minutes Correct Answer Incorrect Answer
    E 22 minutes Correct Answer Incorrect Answer

    Solution

    Volume of the tank = ฯ€rยฒh = (22/7) ร— 7ยฒ ร— 10ย  = 1540 cubic meters Time to empty the tank = Volume / Rateย  = 1540 / 50 = 30.8 minutes Correct answer: a) 31 minutes (rounded up).

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