Discussion

Explanation:

Let the third tap fill the tank in x hours.

When the three taps are opened together, part of the tank filled in 1 hour = 1/30

∴ 1/16 - 1/40 + 1/x = 1/30

∴ 1/x = 1/30 - 1/16 + 1/40

∴  1/x = (8 - 15 + 6)/240 

∴  1/x = -1/240  

∴ The third pipe empties the tank in 240 hours.

Hence, option (e).

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