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.