SOLUTION: One pipe can fill a tank in 5 hours. A second can fill it in 3 hours. How long will it take both pipes together to fill the tank?

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Question 777791: One pipe can fill a tank in 5 hours. A second can fill it in 3 hours. How long will it take both pipes together to fill the tank?
Found 2 solutions by jim_thompson5910, dkppathak:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
1%2F5+%2B+1%2F3+=+1%2Ft

3%2F15+%2B+5%2F15+=+1%2Ft

8%2F15+=+1%2Ft

8t+=+15%2A1

8t+=+15

t+=+15%2F8

Answer: 15%2F8 hours (that's equivalent to 1%267%2F8 hours or 1.875 hours)

Answer by dkppathak(439) About Me  (Show Source):
You can put this solution on YOUR website!
One pipe can fill a tank in 5 hours
one pipe can fill the tank in 1 hrs =1/5 part
second can fill it in 3 hours
second pipe 1 hrs can fill =1/3 parts
both pipe together can fill in one hours =1/3+1/5=8/15 parts
full part can fill by both pipe=15/8 hrs
=1 hrs 52 minutes 30 second
answer 1 hrs 52 minutes 30 seconds