## anonymous 5 years ago Jack usually mows his lawn in 6 hours. Marilyn can mow the same yard in 4 hours. How much time would it take for them to mow the lawn together?

1. anonymous

Let x = the time for both to mow the same lawn working together.$\frac{1}{6}+\frac{1}{4}\text{=}\frac{1}{x}$$\frac{5}{12}\text{= }\frac{1}{x}$Solve for x. The dimensional unit for x is hours. Another view. $\frac{1}{6}+\frac{1}{4}=\frac{5}{12}$Jack and Marilyn can mow 5 lawns in 12 hours. You divide the numerator and denominator by 5 to determine how long it would take to Jack an Marilyn to move the equivalent of one lawn in hours.

2. anonymous

error in the last sentence. The word move should be replaced with the word mow.