Question

4 pipes can fill a tank in 16 hrs how long will it take to fill the tank if 12 pipes of the same dimensions are used

Answer 1

Here's the ANS
If 4 pipes takes 16 hrs to fill a tank.
Therefore 12 pipes will take (12×16÷ 4) 48hrs to fill the same tank.

Answer 2

If 4 pipes takes 16 hours then 12 pipes take (16×4/12)
=64/12
5hours and 18 mint