A can work three times as fast as B. Together they can finish a job in 24 days. In how many days can A complete the job alone?	Choose the most appropriate option:
A) 28 B) 30 C) 32 D) 34 E) 36
B's rate is x and A's rate is 3x.   x + 3x = 1/24   x = 1/96   A's rate is 3x = 1/32   A can complete the job in 32 days.   The answer is 32.
<result>C</result>
A can work three times as fast as B. Together they can finish a job in 24 days. In how many days can A complete the job alone?