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
Explanation
Statement 2 alone answers the question.
Average speed needs the whole distance and the whole time.
Statement 1 gives only the first 50 miles, leaving the rest unknown, so it is not enough.
Statement 2 gives 8 p.m. to 4 a.m. = 8 hours for all 100 miles.
Average speed = 100 / 8 = 12.5 mph, so Statement 2 alone suffices.
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