Civil Service Exam Reviewer · Word Problems · hard
A delivery van traveled 480 km in 9 hours. Part of the trip was at 40 km/h and the rest at 70 km/h. How many hours did it travel at 40 km/h?
- 4 hours
- 4.5 hours
- 6 hours
- 5 hours
Answer
D. 5 hours
Solution
40t + 70(9 − t) = 480 → -30t = -150 → t = 5 hours.
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