Ernie can paint a house in just 2 hours. Izzy can paint a house in 5 hours (because she takes breaks to read and sip lemonade ). Working together, how long will it take them to paint 2 houses?

Guest Aug 25, 2021

#1**-1 **

Ernie paints 1/2 a house per hour

Lizzie paints 1/5 of a house per hour

Together they paint 1/5 + 1/2 = 7/10 of a house in an hour

So that is 10/7 hours per house, and that's 20/7 hours for two houses

OrangeJuicy Aug 25, 2021