Friday

November 21, 2014

November 21, 2014

Posted by **tiffany** on Thursday, August 27, 2009 at 10:52am.

- Math -
**Reiny**, Thursday, August 27, 2009 at 12:04pmBill's rate = lawn/6

Jim's reate = lawn/9

combined rate = lawn/6 + lawn/9

=5lawn/18

Time for combined effort = lawn/[5lawn/18]

= 18/5 minutes

= 3.6 minutes

Notice that "lawn" canceled, so we could have used any constant for "lawn"

in general for individual times of a,b,c,.. units of time

the time for a combined effort would be

1/[1/a + 1/b + 1/c + ...] units of time

**Answer this Question**

**Related Questions**

math - Abe can mow the lawn in 15 minutes.Ben can mow the lawn in 20 minutes....

MATH - Abe can mow the lawn in 15 minutes. Ben can mow the lawn in 20 minutes....

Algebra 1 - You can mow your whole lawn in 45 minutes, and your neighbor can mow...

Math - someone can mow his lawn in 48 minutes. if his daughter helps, they can ...

college intermediate algebra - Working together, two people can mow the lawn in ...

Math - Mike can mow a lawn in 3 hours. Paul can mow the same lawn in 2 hours. ...

Math Project..Please help me.. - 1. Samuel is 2/3 as old as his brother. In five...

Math - 1) Matt traveled the first leg of his trip for 1350 miles on a large jet...

Math - 1. Samuel is 2/3 as old as his brother. In five years, he will be 3/4 as ...

Help!! - 1. Samuel is 2/3 as old as his brother. In five years, he will be 3/4 ...