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Three pipe P, Q and R can fill a tank in 12 minutes, 18 minutes and 24 minutes respectively. The pipe R is closed 12 minutes before the tank is filled. In what time the tank is full? |
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Answer» ` 8 5/13 hrs.` Let capacity of tank `= LCM of (12, 18, 24)=72` units `therefore` P in 1 min can fill 6 units Q in 1 min can fill 4 units R in 1 min can fill 3 units `therefore (10 t + 3 (t-12)=72` `13 t= 108` `rArr t = 8 4/13` hours |
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