(25 points) plz ay help would be appreciated and will be given to best answer/for e-f find the value of x, y.z in each figure

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?