A cistern can be filled by pipe A and B in 4 hours and 6 hours respectively. When full, the cistern can be emptied by a pipe C in

1 thought on “A cistern can be filled by pipe A and B in 4 hours and 6 hours respectively. When full, the cistern can be emptied by a pipe C in”

1. Step-by-step explanation:

   A pipe = 1/4

   B pipe = 1/6

   So add them both

   1/4 + 1/6

   6/24 + 4/24

   = 10 / 24 hours and 10/24 becomes 5/12 hours

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