Paper 1 · Mathematical Reasoning and Aptitude
A horse ran 100 miles without stopping. What was its average speed in miles per hour? Statement I: The horse ran 20 miles/h for the first 50 miles. Statement II: The entire journey started at 8 p.m. and ended at 4 a.m. the next day.
AStatement I alone is sufficient
BStatement II alone is sufficient ✓ Correct
CBoth statements together are sufficient
DNeither statement is sufficient
Correct answer: (B) Statement II alone is sufficient — Statement II alone is sufficient, so that is the answer.
Explanation
★Statement II alone is sufficient, so that is the answer.
★The average speed is the total distance divided by the total time.
★Statement II gives the total time from 8 p.m. to 4 a.m., which is 8 hours.
★With the known distance of 100 miles, the average speed is 100 divided by 8.
★Statement I tells the speed for only the first half, which alone does not give the average.
★So Statement II alone is sufficient.
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