ISEE Word Problems Question 124: Answer and Explanation
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Question: 124
6. Two cars start from the same point at the same time. One drives north at 20 miles per hour and the other drives south on the same straight road at 36 miles per hour. How many miles apart are they after 30 minutes
- A. Less than 10
- B. Between 10 and 20
- C. Between 20 and 30
- D. Between 30 and 40
Correct Answer: C
Explanation:
The correct answer is (C). One car went 20 mph for 
hour = 10 miles.
The other car went 36 mph for 
hour = 18 miles. Since they went in opposite directions, add the two distances to find the total number of miles apart. 10 + 18 = 28