Two taps A and B can fill a tank in 10 ...

Two taps A and B can fill a tank in 10 minutes and 15 minutes respectively. In what time will the tank be full if tap B was opened 3 minutes after tap A was opened ?

6 minutes 12 seconds

7 minutes 12 seconds

8 minutes 12 seconds

9 minutes 12 seconds

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The correct Answer is:

Find the work done by A in 3 minutes.

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