Question : 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 remaining tank to be full?
Option 1: 20 minutes
Option 2: 25 minutes
Option 3: 30 minutes
Option 4: 45 minutes
Answer (1)
22nd Jan, 2024
Correct Answer: 45 minutes
Solution :
One minute's work of Tap A =
One minute's work of Tap B =
For 5 minutes, both taps are open
=
=
Remaining part
So,
The required time
Hence, the correct answer is 45 minutes.
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