ISEE Mathematics Achievement Question 95: Answer and Explanation
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Question: 95
11. Two cars start toward each other along a straight road between two cities that are 450 miles apart. The speed of the first car is 35 mph, and that of the second is 48 mph. How much time will elapse before they meet
- A. 6.01 hours
- B. 5.42 hours
- C. 5.25 hours
- D. 4.98 hours
Correct Answer: B
Explanation:
The correct answer is (B). The distance between the cars is being reduced at a rate equal to the sum of their speeds. They are coming closer together at 35 + 48 = 83 miles per hour. Since the distance between them was 450 miles, the time required for traveling is 450 ÷ 83 = 5.42 hours. Remember that distance is the product of rate and time, or d = rt.