UP TGT Mathematics Commercial Mathematics Test Series - Part 4
Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both pipes are opened together, but after 4...
Type: MCQ • Marks: 1
Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both pipes are opened together, but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?
Options
A. 1) 16 minutes
B. 2) 15 minutes
C. 3) 14.67 minutes
D. 4) 12 minutes
Explanation
Total capacity = 60 units. A = 4, B = 3 units/min. In 4 min together, work done = 4*(4+3) = 28 units. Remaining = 32 units. Time taken by B alone = 32 / 3 = 10.67 minutes. Total time = 4 + 10.67 = 14.67 minutes (14 min 40 sec).
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