Question

To fill a cistern, pipes A,B,C take 25 minutes, 15 minutes and 12 minutes
respectively. Find the time in minutes that the three pipes together will take to fill
the cistern(approximately)?​

Answer 1

Step-by-step explanation:

Let the capacity of cistern be 60 units [L.C.M of 20,15 and 12]

A does =

20

60

=3 units / minute B does =12

60

=5 units / minute

(A + B + C)'s per minute work = (3+4+5)units / minute=12units / minute

Together they will fill the tank is

12

60

=5 minutes........

Hope this will help you

Answer 2

Let the cistern's capacity be 60 units [L.C.M of 20, 15, and 12].

A does = 20 60 = 3 units per minute B does =12 60 =5 units per minute (A + B + C) per minute work = (3+4+5)units per minute=12units per minute

They will fill the tank in 12 60 = 5 minutes if they work together.

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