Choose the one alternative that best completes the statement or answers the question.

Solve the problem.
-Tom Quig traveled 250 mi east of St. Louis. For most of the trip he averaged 70 mph, but for one period of time he was slowed to 10 mph due to a major accident. If the total time of travel was 7 hr, how many miles did he drive at the reduced speed?
A) 40 mi
B) 50 mi
C) 60 mi
D) 35 mi

Question

Choose the one alternative that best completes the statement or answers the question. 
 
Solve the problem.
-Tom Quig traveled 250 mi east of St. Louis. For most of the trip he averaged 70 mph, but for one period of time he was slowed to 10 mph due to a major accident. If the total time of travel was 7 hr, how many miles did he drive at the reduced speed?
A) 40 mi
B) 50 mi
C) 60 mi
D) 35 mi

Quizplus · Accepted Answer

Tom traveled 250 miles in total. Let x be the miles traveled at 10 mph. Then, (250 - x) miles were traveled at 70 mph. The time for the slow part is x/10 hours, and for the fast part is (250-x)/70 hours. The total time is 7 hours: x/10 + (250-x)/70 = 7. Solving this equation gives x = 40 miles.

Choose the One Alternative That Best Completes the Statement or Answers