Margo walks to her friend's house in 10 minutes. Using the same route, it takes Margo 20 minutes to get back home. If her average walking rate for the entire trip is 4 miles per hour, how many total miles did she walk?

Margo walks 1 mile

Step-by-step explanation:

Given that;

Margo walks to her friend's house in 10 minutes.

Using the same route, it takes Margo 20 minutes to get back home.

Total walking rate = 20 + 10 = 30 minutes

The average of her walking rate for the entire trip is 4 miles per hour

i. e 30/2 minutes = 4 miles/hr

15 minutes = 4 miles/hr

Let x be the total number of miles that Margo walk;

So;

15 minutes * x = 4 miles/hr

15 minutes * x = 4 miles / 60 minutes

x = (4 miles / 60 minutes) * 15 minutes

x = 1 mile

Thus, Margo walks 1 mile