Starting at home, jessica traveled uphill to the toy store for 12 minutes at just 10 mph. she then traveled back home along the same path downhill at a speed of 30 mph. what is her average speed for the entire trip from home to the toy store and back?

15 mph

Step-by-step explanation:

Given: Time taken to travel uphill to the toy store= 12 minutes

Let d be the distance(in miles) between the home and toy store.

Also,

Thus, distance from home to toy store= 2 miles

When she turn back, to home distance remains same.

The time taken by her to come back at 30 mph speed=

Now, the average speed =

step-by-step explanation:

the answer is  

a.

28 ft2

step-by-step explanation: