Three pipes P,Q and R can fill a tank in 12, 15 and 20 minutes respec – InterviewSolution

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1.	Three pipes P,Q and R can fill a tank in 12, 15 and 20 minutes respectively. If pipe P is opened all the time and pipe Q and R are opened for one hour alternatively. The tank will be full in
Answer» 5 hr 6 hr 7 hr 8 hr SOLUTION :`(1//12 + 1//15) + (1//12 + 1//20) = 17/60` (in 2 hrs this much) tank is filled) So in 6 hrs 51 /60 is filled . Remaining, ` 9/60= (1/12 +1/15 ) xx T, ` so `T = 1 hr` so TOTAL ` = 6 + 1 = 7 hr`

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