Question

if one person can mow the lawn in 4 hours and another can mow the lawn in 5 hours how long would it take them if the did it together?
Please give me an equation so I can figure this out

Answer 1

9/20

Answer 2

one rate is
\[\frac{1}{4}\] other rate is
\[\frac{1}{5}\] combined rate is
\[\frac{4+5}{4\times 5}\] and you wan to solve
\[\frac{4+5}{4\times 5}T=1\] for T, get
\[\frac{4\times 5}{4+5}=\frac{20}{9}\]

Answer 3

sorry i had it upside down. it is
\[\frac{4\times 5}{4+5}\]

Answer 4

nevermind I got it