One pipe can fill a pool in 10 hours. Another pipe can fill the pool in 30 hours. How long would it take them to fill the pool if they were working together?

Answer 1

rate 1 = R1 = 1 pool/10 hr
R2 = 1 pool/30 hr

together
(1 pool/10 hr) T + (1 pool/30 hr)T = 1 pool

T/10 + T/30 = 1
3 T/30 + 1 T/30 = 1
4 T = 30
T = 7.5 hours

Answer 2

lol u so bad. it's 7.5 hours

Answer 3

2
One pipe can fill a pool in 9 hours. Another pipe can fill the pool in 6 hours. How long would it take them to fill the pool if they were working together?
Answer

Answer 4

7 hours 30 minutes

Answer 5

7 hours 30 minutes or 7.5 hours

Damon gave a great explanation I'm just restating this in case someone missed his