Problem: An automobile travels 6a feet in r seconds. If this rate is maintained for 3 minutes, how many yards does it travel in the 3 minutes?
Answer Choices:
A. 1080ra
B. a30r
C. r30a
D. a10r
E. r10a
Solution:
D (yards) =R (yards per minute) ×T (minutes)
D=60r31⋅6a⋅3=r10a