Please help me i dont understand this

The table shows the distance traveled over time while traveling at a constant speed.

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

Acircle has a circumference of 28.36 units what is the diameter of the circle