All of the following are common causes of electrical accidents and injuries, except a) tools that cause shocks or emit smoke, excessive heat, odors, or sparks b) wires running across the floor c) electrical cords left near heat, flame or water d) three pronged plugs

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?