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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
87% (00:44) correct
13%
(01:01)
wrong
based on 101
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John is driving from Town A to Town B. What is his average speed over the entire trip?
(1) He drives the entire 120 miles in 3 hours.
(2) His maximum speed during the trip was 50 miles per hour and his minimum speed was 30 miles per hour.
(A) Statement 1 alone is sufficient, but statement 2 alone is not.
(B) Statement 2 alone is sufficient, but statement 1 alone is not.
(C) Both statements together are sufficient, but neither alone is sufficient.
(D) Each statement alone is sufficient.
(E) Neither statement is sufficient, even when combined.
(1) He drives the entire 120 miles in 3 hours.
(2) His maximum speed during the trip was 50 miles per hour and his minimum speed was 30 miles per hour.
(A) Statement 1 alone is sufficient, but statement 2 alone is not.
(B) Statement 2 alone is sufficient, but statement 1 alone is not.
(C) Both statements together are sufficient, but neither alone is sufficient.
(D) Each statement alone is sufficient.
(E) Neither statement is sufficient, even when combined.
25 Aug 2026, 19:50
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Bunuel
The most important thing to remember for average speed is that it equals \(\frac{\text{total distance}}{\text{total time}}\), NOT the straight average of speeds.
Statement 1:
This gives you the total distance and the total time, so you can calculate the average speed. (You don't need to actually do the calculation, but it's easy enough: 120/3 = 40 miles per hour.) Sufficient.
Statement 2:
This gives you maximum and minimum speeds, but no indication of distance or how long John spent at each speed (or any speed in between). You can't simply take the average of 30 and 50. Many answers are possible. Not sufficient.
The answer is A.
Common dangers with average speed questions include finding the straight average of speeds or overcomplicating the calculation. Remember, \(\text{average speed}=\frac{\text{total distance}}{\text{total time}}\)
