Question

Alex walked 1 mile in 15 minutes. Sally walked 3,520 yards in 24 minutes. In miles per hour, how much faster did Sally walk than Alex? (Note: 1 mile = 1,760 yards)

Answer 1

First we need to convert yard to miles

3520yards÷1760yards/mile=2 miles

From there we know:
Alex walked 1 mile for 15 mins and Sally walked 2mile in 24 mins

We need to convert these mileages to miles per hour

1mile/15mins*60mins/hour=4miles /hour
2mile/24mins*60mins/hour=5miles per hour

Alex walks at 4 miles per hour and Sally at 5 miles per hour

Sally walks 1 mile per hour faster than Alex