Emily spent 1 9/10 longer cleaning her room
Explanation:The difference between the number of hour Emily and Aubrey spent cleasing is how much longer Emily spent.
4 1/2 = 9/2, and
2 3/5 = 13/5
So
4 1/2 - 2 3/5 = 9/2 - 13/5
= (45 - 26)/10
= 19/10
= 1.9
OR
1 9/10
