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    Question

    A cylindrical tank with a height of 12 meters and a

    radius of 7 meters is filled with water. It has a leakage at the bottom that drains water at a rate of 25 liters per minute. How long will it take to empty half of the tank?
    A 616 hours Correct Answer Incorrect Answer
    B 625 hours Correct Answer Incorrect Answer
    C 617 hours Correct Answer Incorrect Answer
    D 670 hours Correct Answer Incorrect Answer

    Solution

    Volume of the tank = ╧Аr┬▓h = (22/7) ├Ч 7┬▓ ├Ч 12 = (22/7) ├Ч 49 ├Ч 12 = 1848 m┬│. Half of the volume = 1848 / 2 = 924 m┬│. Convert to liters: 924 ├Ч 1,000 = 9,24,000 liters. Time to empty = Volume / Rate = 9,24,000 / 25 = 36,960 minutes. Convert to hours: 36,960 / 60 = 616 hours. Correct answer: a) 616 hours.

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