Question

a pipe can fill in tank in 15 minutes while another pipe can fill the tank in 30 minute . a third pipe can empty the tank in 12 minutes . in what time will the empty tank be filled completely if all three pipes are opened together

Answer 1

Answer:

all pipes take 5.45 min to fill the tank

Step-by-step explanation:

1st pipe takes 15 min to fill the tank work done 1/15

2nd pipe takes 30 min to fill the tank work done 1/30

3rd pipe takes 12 min to fill the tank work done 1/12

when all the pipes are open together then it take time =

work done =1/15+1/30+1/12= 11/60

time taken =60/11= 5.45 min