Question

The diameters of three inlet pipes of a cistern are 1.5 cm, 2 cm and 2.5 cm respectively. The pipe with the maximum diameter can alone fill up the cistern in 3 hours and 36 minutes. Find the time in which the empty cistern will be filled if all the three inlet pipes are opened together.

A 1 hour 36 minutes
B 1 hour 48 minutes
C 216/235 hours
D 235/216 hours
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