Digital PSAT Math Practice Question 217: Answer and Explanation
Question: 217
A bus is travelling at a constant rate of 50 miles per hour. At this rate, how far will the bus travel in 
hours?
- A. 150 miles
- B. 160 miles
- C. 162.5 miles
- D. 175.5 miles
Correct Answer: C
Explanation:
(C) Recognize that d = rt where d is distance, r is rate, and t is time. In this problem, r = 50 and 
. Use this to solve for distance:
d = rt = 50 ´ 3.25 = 162.5, answer (C).
Alternatively, you could have done dimensional analysis to cancel out the units you don't want, leaving you only with the units you do want (miles):
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