Question

A tap can fill a cistern in 8 hour while tap B can fill in 4 hour in how much time will cistern be filled if both A and B are opened together
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Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:

2 2/3

Step-by-step explanation:

let capacity of cistern

= L.C.M(8,4) = 8 units

A => 8/8 = 1 units/h

B => 8/4 = 2 units/h

together = 1+2 = 3 units/h

so together they will fill it in

= 8/3 hr = 2 2/3 hr

OR

let they will it in x h

1/8 + 1/4 = 1/x

x = 32/12 = 2 8/12 = 2 2/3 hr