Question

Julia can finish a 20-mile bike ride in 1.2 hours. Katie can finish the same bike ride in 1.6 hours. How much faster does Julia ride than Katie?

Answer 1

Julia's speed = 20/1.2 in miles per hour


Katie's speed = 20/1.6 in miles per hour


Since Julia is faster, we subtract her speed from Katie's to determine how much faster Julia rides: 

(20/1.2) - (20/1.6)

---------------

how much faster Julia rides

---------------

4.1666


So Julia is approximately 4.2 miles per hour