Question

Marie drives from her home to the supermarket 10 miles away and then drives back home after shopping. If it takes her 2 hours for the entire trip, including one hour spent shopping in the supermarket, what was her average speed driving to and from the supermarket?

Answer 1

Average speed is represented by the following expression:

$\text{Speed}=\frac{\text{distance}}{\text{time}}$

Since it takes 1 hour driving to and from the supermarket, the average speed would be:

$\text{Speed}=\frac{10}{1}\frac{miles}{\text{hour}}$

Then, for each trip she drives:

$5\frac{\text{miles}}{\text{hour}}\text{ driving to and 5 miles/hour driving from the supermarket.}$