Answer: Day 1
Explanation: You have to first divide each one by distance divided by time.
Day 1 - 100/90 = 1.1 repeated
Day 2 - 150/140 = 1.07 repeated
Day 3 - 209/200 = 1
Day 4 - 250/235 = 1.07 repeated
The one with the largest number is the one that took the slowest which would be Day 1.
