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One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill the tank in 36 minutes, then the slower pipe alone will be able to fill the tank in :

A80 min

B144 min

C108 min

D180 min

Answer:

B. 144 min

Read Explanation:

if slower pipe takes x minutes to fill the tank faster pipe takes x/3 minutes to fill the tank Part of the tank filled by slower pipe in 1 minute = 1/x Part of the tank filled by faster pipe in 1 minute = 3/x 1/x + 3/x = 1/36 4/x = 1/36 x = 4 × 36 = 144 minutes


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