Question

A tank has two pipes X and Y. Pipe Y empties the tank. If only pipe X is open, then the
tank is filled in 14 hours and if both the pipes are open, then the tank is filled in 21 hours. In how much time can the full tank be emptied if only pipe Y is open?​

Answer 1

Answer:

Given:X pipe takes 14 hours to filled

if both pipe X and Y are opened its takes 21 hours

find Y required time to empty the tank

so, X+Y=21

14 +X=21

21-14=7

Y=7

Therefore:7 hours time is required when Y pipe is open

Answer 2

Answer:

Y=7is answer........................