Two pipes S1 and S2 alone can fill an empty tank in 15 hours

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Two pipes S1 and S2 alone can fill an empty tank in 15 hours and 20 hours respectively. Pipe S3 alone can empty that completely filled tank in 40 hours. Firstly both pipes S1 and S2 are opened and after 2 hour pipe S3 is also opened. In how much time tank will be completely filled after S3 is opened?

[SSC CGL 21 July 2023 Shift 2 With Answers]

A

90/17 hours

B

89/12 hours

C

90/13 hours

D

92/11 hours

EXPLANATION

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