Mathematics
Medium
Question
A large tanker can be filled by two pipes A and B in 60 and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half?
A
15 min
B
20 min
C
27.5 min
D
30 min
✓ Official correct answer
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A
15 min
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B
20 min
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C
27.5 min
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D
30 min
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