ISEE Mathematics Achievement Question 43: Answer and Explanation
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Question: 43
1. If a vehicle is to complete a 20-mile trip at an average rate of 30 miles per hour, it must complete the trip in
- A. 20 minutes.
- B. 30 minutes.
- C. 40 minutes.
- D. 50 minutes.
Correct Answer: C
Explanation:
The correct answer is (C). No calculations are needed here. Note that a 20-mile trip at 60 mph (which is 1 mile per minute) would take 20 minutes. Since the vehicle is traveling half as fast (30 mph), the 20-mile trip should take twice as long, or 40 minutes.