2. 外语
  3. The table above shows the one-way driving distance, in miles, between four cities: P, Q, R, and S. For example, the distance bet

The table above shows the one-way driving distance, in miles, between four cities: P, Q, R, and S. For example, the distance bet

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问题 The table above shows the one-way driving distance, in miles, between four cities: P, Q, R, and S. For example, the distance between P and Q is 144 miles. If the round trip between S and Q is 16 miles further than the round trip between S and R, and the round trip between S and R is 24 miles less than the round trip between S and P, what is the value of X?  
选项 A、174
B、182
C、186
D、348
E、364
答案B
解析 To find X, the distance between S and Q, start with a number you know; the distance between S and P is 186 miles, and the round trip therefore is 372 miles; 372=the SR round trip+24 miles, so SR round trip=348 miles; SQ round trip=SR round trip-16 miles, so SQ round trip=364. X is the one-way SQ distance, so 364/2=182.
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