Michael and Robert, two high school sprinters, competed in the 800m sprint earlier today. Both were attempting to implement the negative split strategy, though with varying degrees of success. Both Michael and Robert competed the first 400m of the 800m sprint in 2 minutes, but Michael completed the last 400m in 1 minute and 30 seconds, while Robert completed the last 400m in 1 minute and 45 seconds. Which athlete had a larger negative split?
A:
Michael