A pipe can fill a cistern in 6 hrs. Due to a leak in its bottom, it is filled in 7 hrs. When the cistern is full, in how much time will it be emptied by the leak?

1:

42 hrs

2:

40 hrs

3:

43 hrs

4:

45 hrs

5:

None of these

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IBPS RRB Clerk Prelims 2017

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