Pipes A and B can fill a tank in 10 hours and 15 hours respectively.

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Pipes A and B can fill a tank in 10 hours and 15 hours respectively. Both together can fill it in ?

1. 12¹/₂ hours
2. 6 hours
3. 5 hours
4. None of these

Correct Option: B

Part filled by A in 1 hour = 1/10
Part filled by B in 1 hours = 1/15
Part filled by (A + B) in 1 hour = (1/10 + 1/15) = 5/30 = 1/6
∴ Both pipes together can fill the tank in 6 hours.