Question 274139
Let d= the distance Lana drove
Let 1/3d= Distance Tony drove
Let d+12= distance Mark drove.
Add all the distances together
D+1/3d+d+12=334
Now add like terms and gett all the "d's" together.
7/3d+12=334
No you must get rid of the fraction so multiply everything by 3.
7D+36=1002
7D=966
D=138
Lana drove 138 miles.
Tony drove 46 miles.
Mark drove 150 miles.
Check your work.
138+46+150=334 miles altogether 
Hope I helped >.<