Subject: mathqa
Question: the amount of time that three people worked on a special project was in the ratio of 2 to 4 to 6 . if the project took 144 hours , how many more hours did the hardest working person work than the person who worked the least ?
Option: 
A: 45 hours
B: 49 hours
C: 50 hours
D: 48 hours
Answer: D