Discussion

Explanation:

Let pipe C can fill the tank in x hours.

When the three pipes are opened together, part of the tank filled in 1 hour = 1/12.

130+124+1x=112

∴ 1x=112-130-124

∴ 1x=1120

∴ Pipe C fills the tank in 120 hours.

Hence, option (c).

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