Question

Two pipes can fill a cistern in 19 18 minutes respectively while third pipe can empty it in 5 minutes how long will it take to fill the empty sister if all the three pipes are opened simultaneously

Answer 1

Answer:

NEVER

Step-by-step explanation:

a= 1/19

b=1/18

empty = 1/5

all together = 1/19 + 1/18 - 1/5 = (90+95-342)/1710= -157/1710