instruction:
You are given a sentence and a question. You're expected to write the correct answer based on the sentence.
question:
Sentence: Franklin found that if he slides a turtle on its back across a pool table, it slides farther than if he were to slide the turtle across a pile of leaves. He realizes this because there is less resistance on the pool table. Question: The difference in the length that the turtle slides across both surfaces can be attributed to which surface being rougher?
answer:
pile of leaves


question:
Sentence: Tony and Alex are riding motorcycles across the country.  Tony rides until early afternoon, but Alex rides until nightfall. Question: Who rode farther?
answer:
Alex


question:
Sentence: Kim and Dan begin driving in a straight line at the same speed. Question: If Kim drives for half as much time as Dan, who will go a shorter distance?
answer:

Kim