Question

Pipe a can fill a tank in 5 hours, pipe b in 10 hours and pipe c in 30 hours. If all the pipes are open, in how many hours will the tank completely ?

Answer 1

Hello there,
Here's the answer:

given,
Part filled by a in 1 hour = 1/5
Part filled by b in 1 hour = 1/10
Part filled by c in 1 hour = 1/30

Part filled by (a+b+c) in 1 hour
=(1/5)+(1/10)+(1/30)
= 1/3

•°• All pipes will fill the tank in 3 hours.

;)
hope it helps

Answer 2

Yes the procedure is correct