Question

Carla is riding a motorcycle across the country. After 4 hours, she is 600 miles from Denver. After 8 hours, she is 320 miles from Denver. What is the total distance, in miles, to Denver from where Carla started riding?

Answer 1

If Carla's progress toward Denver is at a constant rate, it amounts to (600 -320) miles in 4 hours, so is 280 miles in 4 hours.

Carla started 600 +280 = 880 miles from Denver.