John traveled 150 km in 6 hours and Alice traveled 180 km in 4 hours. What is the ratio of the average speed of John to average speed of Alice?

A 5 : 9

explanation

The average speed of John is: 150 ÷ 6 = 25 km
The average speed of Alice is: 180 ÷ 4 = 45 km
Write the ratio and simplify.
25 : 45 ⇒ 5 : 9