Mathematics
Medium
Question
Two pipes P and Q can fill a cistern in 12 min. and 15 min. respectively but a third pipe ‘R’ can empty the full tank in 6 min. P and Q are kept open for 5 min. in the beginning and then ‘R’ is also opened. In what time is the cistern emptied ?
A
30 min
B
35 min
C
40 min
D
45 min
✓ Official correct answer
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A
30 min
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B
35 min
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C
40 min
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D
45 min
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