The owner of a restaurant wanted to know what additional menu options would sell best. He selects 50 customers at random and surveys them for their preferred menu options. P L E A S E - H E L P - F R O M - U S A - T E S T - P R E P

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?