Question

Suppose that a small pump can empty a swimming pool in 90 hours and that a large pump can empty a pool in 60 hours

Answer 1

\[\frac{ x }{ 60 }+\frac{ x }{ 90 }=1\]

\[\frac{ 90x+60x }{ 5400 }=1\]

\[150x=5400\]

\[x=36\]

Answer 2

Thank you :D

Answer 3

My Pleasure.