Question

Pipes ‘A’ and ‘B’ together can fill a tank in 18 hours, while pipe ‘B’ alone can fill it in 36 hours. If pipe ‘C’ takes 12 hours less than pipe ‘A’ to fill the tank, then how much percent more/less efficient is pipe ‘C’ compared to pipe ‘B’?

A 25%
B 45%
C 50%
D 38%
E None of these
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