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A tap can fill a tank in 10 hours. After filling half the tank, four more similar taps are opened. What is the total time taken to fill the tank completely?1). 5 hours 45 minutes2). 6 hours3). 5 hours 48 minutes4). 6 hours 45 minutes |
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Answer» Given, a tap can fill a TANK in 10 hours. ∴ In 1 hour, the tap fills 1/10th PART of the tank. To fill half the tank, time required = 5 hours. Now, part of tank EMPTY = ½ Given, 4 more similar taps are opened. ∴ In 1 hour, 5 taps fill part of tank = 5 × 1/10 = ½ ∴ to fill the half filled tank, the taps require 1 hr. Total time taken = 5 hr + 1 hr = 6 hr |
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