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A and B are two taps which can fill a tank in 6 hourse and 9 hours, respectively. C is an emptying tap, which can empty the tank in `7.5` hourse Tap B is opened 3 hours after tap A is opened. For how long does tap C to be ketp opne if the tank has to be filled in 6 hours ?A. `1(1)/(2)` hoursB. `2(1)/(2)` hoursC. 3 hoursD. 5 hours |
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Answer» Correct Answer - B (i) Tap A is opend for 6 hours and Tap Fror 3 hours. (iii) Let C be opened for x hours. (iii) Solve `(6)/(6)+(3)/(9)-(x)/(7.5)=1`, for x |
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