Let u=(5 -12) and c=-3 what is ||cu||?

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

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Multiplying fractions by whole number 5 x 1/3=?