Question

A water tank can be filled by a pipe a in 30 minutes and by pipe b in 40 minutes. the same tank can be emptied by a pipe c in 25 minutes. how much time will it take to fill the tank if all the pipes are opened at the same time

Answer 1

IT WILL TAKE 45 MINUTES AS
$30 + 40 = 70 - 25 = 45minutes$

Answer 2

rate of tank are 1/30+1/40 -1÷25 = 20+15-24/600=11/600 time=600/11=54 min
you can mark this as brainliest answer if you want to earn more points