Question

Pipe A and pipe B can fill the empty tank in 18 hours and 30 hours respectively, whereas pipe C can empty the full tank in ‘x’ hours. Find the value of ‘x’ if pipes A, B and C together can fill the empty tank in 12 hours.

A 60 hours
B 90 hours
C 150 hours
D 180 hours
E 210 hours
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