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?
+118687 Ernie pains 1/2 a house per hour
Lizzie pains 1/5 of a house in an hour
Together they paint 1/5 + 1/2 = 7/10 of a house in an hour
So that is 10/7 hours per house
\(\frac{10hours}{7houses}*2 houses= \frac{20}{7}hours\)
So that is
2 hours 51minutes and 26 seconds to the nearest second.
