Mathematics
Medium
Question
Two pipes A and B can fill a tank in 15 min and 20 min respectively. Both the pipes are opened together but after 4 min, pipe A is turned off. What is the total time required 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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