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Taps P and Q can fill a tank in 6 hours and R can empty it in 4 hours. If all the taps are opened together. In how much time will the tank be empty? 1. 8 hours2. 11 hours3. 10 hours4. 12 hours |
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Answer» Correct Answer - Option 4 : 12 hours Given: P and Q can fill a tank = 6 hours R can empty fill a tank = 4 hours Formula Used: Work done = Total work/Total work done in 1 hour Calculation:
Work done = Total work/Total work done 1 hour by all three ⇒ Work done by (P + Q + R) = 12/(-1) = 12 hours ∴ Work done by P, Q and R in 12 hours. The correct option is 4 i.e. 12 hours |
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