ISEE Word Problems Question 119: Answer and Explanation
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Question: 119
1. One runner can run M miles in H hours. Another faster runner can run N miles in L hours. The difference in their rates can be expressed as
- A.
- B. MH - HL
- C.
- D.
Correct Answer: D
Explanation:
The correct answer is (D). The rate of the first runner is 
miles per hour. The rate of the second is 
miles per hour. The second runner is faster, so the difference in their rates is written 
.