Question: Two blimps take off from the same airfield and fly at the same velocity once they reach altitude. The red blimp flies for a 29 minutes and lands at a nearby town, while the green blimp stays in flight for 21 minutes and lands at the previous town. This means that? 
Option 1: the red blimp flew a greater distance
Option 2: the green blimp flew a greater distance.
Answer: Option 1