A water tank can be filled by a tap in 30 minutes and another tap can fill it in 60 minutes. If both the taps are kept open for 5 minutes and then the first tap is closed, how long will it take for the tank to be full?
A water tank can be filled by a tap in 30 minutes and another tap can fill it in 60 minutes. If both the taps are kept open for 5 minutes and then the first tap is closed, how long will it take for the tank to be full?
[A]20 minutes
[B]25 minutes
[C]30 minutes
[D]45 minutes
45 minutes
Part of the tank filled by both taps in 5 minutes
Remaining part that is fileed by second tap.
Hence option [D] is correct answer.