Quantitative Aptitude Time and Work Pipe and Cistern

Two taps J and K can fill a pool in 6 hours and 8 hours respectively. If both the taps are opened together, then after how many hours should tap K be closed so that the pool is full in 4 hours?

1

2/3 hrs

2

1 hrs

3

2 hrs

4

8/3 hrs

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