What is the slope of the function?

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

You are remodeling your kitchen. you’ve contacted two tiling companies who gladly told you how long it took their workers to tile of a similar size jim completed half the floor in 8 hours. pete completed half of the other floor in 7 hours. if pete can lay 20 more tiles per hour than jim, at what rate can jim lay tiles

Anyone know? is appreciated! will mark brainliest if correct!