Starting at home, jessica traveled uphill to the grocery store for 18 minutes at just 20 mph. she then traveled back home along the same path downhill at a speed of 60 mph. what is her average speed for the entire trip from home to the grocery store and back?

we know that

The speed is equal to the distance divided by the time

Let

x---------> the distance Jessica's home to the grocery store

t1-------> the time from Jessica's home to the grocery store

t2------> the time from grocery store to back home

Step 1

Find the distance x

we have

convert to hour

Step 2

Find the time t2

Step 3

Find the average speed for the entire trip

we know that

the average speed is equal

therefore

the answer is

the average speed for the entire trip is

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step-by-step explanation: