Answer:
The total distance cycled by Jason in 3 hours were 20 miles.
Explanation:
To find the total distance cycled in 3 hours, first we have to calculate the miles cycled in the first 2 hours, this is:

In the first 2 hours Jason cycled 15 miles, now we can apply the distance cycled in the 3rd hour:

The total distance cycled by Jason in 3 hours were 20 miles.