An observer moving toward Earth with a speed of 0.85c notices that it takes 5.0 min for

Question:

An observer moving toward Earth with a speed of 0.85c notices that it takes 5.0 min for a person on Earth to fill her car with gas. Suppose, instead, that the observer had been moving away from Earth with a speed of 0.90c. How much time would the observer have measured for the car to be filled in this case?