PSAT Math Multiple-Choice Question 775: Answer and Explanation

Question: 775

A bus is traveling at a constant rate of 50 miles per hour. At this rate, how far will the bus travel in 3 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 t = 3. Use this information to solve for distance:

The answer is choice (C).
Alternatively, you could have done dimensional analysis to cancel out the units you don't want, leaving you with only the units you do want (miles):
× 3.25 hours = 162.5 miles