Question

Two tap can fill a cistern in 15 hour and 20 hours respectively.A third tap can empty it in 30 hours. How long will they take to fill the cistern all taps are opened?

Answer 1

Answer:

by looking at the LCM of this

A-15

B-20

C-30

LCM=60

4:3:2-efficiency

required time-60/4+3+2

60/9hours

=20/3 hours

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