Two mechanics were working on your car. One can complete the given job in six hours, but the new guy takes 10 hours. They worked together for the first two hours, but then the first guy left to help another mechanic on a different job. How long will it take the new guy to finish your car? Choose the correct answer:
A) 7/4
B) 4/3
C) 15/4
D) 56/15
E) 17/5
Rate(1)=1/6   Rate(2)=1/10   Combined = 8/30   Work done in 2 days=8/15   Work left = 7/15   Rate * Time = Work left   1/8 * Time = 7/15   Time=56/15   56/15
<result>D</result>
Two mechanics were working on your car. One can complete the given job in six hours, but the new guy takes 10 hours. They worked together for the first two hours, but then the first guy left to help another mechanic on a different job. How long will it take the new guy to finish your car?