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A pump can fill a tank with water in 2 hours. Because of a leak, it took 18/5 hours to fill the tank. The leak can drain all the water of the tank in:1. 9/2 hours2. 7/2 hours3. 5 hours4. 4 hours |
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Answer» Correct Answer - Option 1 : 9/2 hours GIVEN: A pump can fill a tank with water in 2 hours. Because of a leak, it took 18/5 hours to fill the tank. CALCULATION: Suppose leak can drain all the water of the tank in ‘T’ hours. So, 1/2 - 1/T = 5/18 ⇒ 1/T = 1/2 - 5/18 ⇒ 1/T = 4/18 = 2/9 Hence, leak can drain all the water of the tank in 9/2 hours. |
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