Wednesday

April 16, 2014

April 16, 2014

Posted by **bill** on Monday, November 14, 2011 at 12:38pm.

- algebra -
**Reiny**, Monday, November 14, 2011 at 1:49pmMary's rate = lawn/3

Sally's rate = lawn/5

combined rate = lawn/3 + lawn/5

= 8lawn/15

time = lawn/(8lawn/15) = 15/8 or 1.875 hrs = 1 hour and about 53 minutes

**Related Questions**

Math - Suppose that it takes Sally 3 hours to mow, and it takes Tom 4 hours to ...

algebra - it john 4 hours to mow a lawn it takes maria 3 hours to mow the same ...

math - Jack usually mows his lawn in 4 hours. Marilyn can mow the same in 5 ...

algebra - Jack usually mows his lawn in 6 hours. Marilyn can mow the same lawn ...

algebra - Bob mosw his lawn in 3 hours, Jane can mow the same lawn in 5 hours. ...

smith - tom can mow a lawn in 4 hours. perry can mow the same lawn in 5 hours. ...

Algebra - Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard ...

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

algebra - jack usually mows his lawn in 4 hours mariltn can mow the same yard in...

Math - if jack can mow his lawn in 4 hours and sue can mow the same lawn in 7 ...