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?

about 1325 mph

Step-by-step explanation:

average speed = total distance / total time = (distance uphill + distance downhill) / (time uphill + time downhill)

time uphill = 606060 minutes / 60 = 10101 hours

path = 666 mph * 10101 hours = 6727266 m

time downhill = 6727266 m / 10101 hours = 55.5 h

average speed = (6727266 m + 6727266 m) / (10101 hours + 55.5 h) = about 1325 mph