Two friends were driving from their home to Manchester, Kevin drove the first 90 miles.............. Who drove the most?

Question

Two friends were driving from their home to Manchester, Kevin drove the first 90 miles, and Daniel took over the remainder of the journey.

On the way back, Kevin drove to begin with, and Daniel took over for the last 100 miles.

Who drove the most?

Answer 1

Daniel drove the most (20 miles more than Kevin).
Total drive: x miles
1e drive: Kevin 90 miles, Daniel (x - 90) miles
2e drive: Kevin (x - 100) miles, Daniel 100 miles
Total driving:
Kevin: 90 + (x - 100) = -10 + x miles
Daniel: (x - 90) + 100 = +10 + x miles
Daniel drives 20 miles more.