Question 443394
Jake's work rate is 1/10 room/hour.
Maura's work rate is 1/8 room/hour

Their combined work rate is {{{1/10 + 1/8 = 4/40 + 5/40 = highlight(9/40)*h}}} rooms

If they work 2.5 hours, they can  work {{{(5/2)*(9/40) = highlight(9/16)}}}.