SAT数学Problem Solving练习题（26）
>>SAT考试：SAT数学Problem Solving练习题（26）
>>SAT考试辅导：精品课程高端指导
Question 26: While competing in a marathon event, John is behind Mike by 100 yards. John runs (x - 2) yards while Mike runs (x + 10) yards. What is the new distance between them?
(a) 112 yards
(b) 108 yards
(c) 102 yards
(d) 110 yards
(e) The answer is a function of x
Solution: We can reference all distances to the point where John was at the time t1, when the distance between them is 100 yards.
After John runs (x - 2) yards, he is (x - 2) yards from the reference.
After Mike runs (x + 10) yards, he is 100 yards + (x + 10) yards = (x + 110) yards from the reference.
The distance between them will be (x + 110) - (x - 2) = 112 yards.
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