Mathematics
NULL
Medium
Question
Pipes A and B fill a tank in 15 and 20 min. Both open for 4 min, then A is turned off. Total time to fill the tank?
A
10 min 20 sec
B
11 min 45 sec
C
12 min 30 sec
D
14 min 40 sec
✓ Official correct answer
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A
10 min 20 sec
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B
11 min 45 sec
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C
12 min 30 sec
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D
14 min 40 sec
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Explanation
In 4 min they fill 7/15. Remaining 8/15 by B takes 32/3 min. Total = 4 + 32/3 = 14 min 40 sec.