<PRE><B>Question 511623</B>
Jack usually mows his lawn in 5 hours. Maria can mow the same yard in 3 hours. How long will it take for them to mow the lawn together?
---
Jack rate = 1/5 job/hr
Maria rate = 1/3 job/hr
---
Together rate = 1/x job/hr
----------------------
Equation:
rate + rate = together rate
1/5 + 1/3 = 1/x
---
Multiply thru by 15x
3x + 5x = 15
8x = 15
x = 15/8 = 1 7/8 hr = 1hr 52.5 minutes (time to do the job together)
============================================
Cheers,
Stan H.
==================</PRE>