According to the given data we have the following:
Whitney earns 312 in 26 hours of work
Andrew earns 451 in 41 hours of work
Lena earns 10 per hour
In order to calculate who earns the most money per hour we would have to calculate the rate of money per hour of Whitney and Andrew and the compare it with Lena.
So, money per hour of whtiney=312/26
money per hour of whtiney=12 per hour
money per hour of Andrew=451/41
money per hour of Andrew=11 per hour
Therefore, Whitney is the person that earns most money per hour.