单选题 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?
P
Q
R
S
P
0
144
171
186
Q
144
0
162
X
R
171
162
0
Y
S
0
X
Y
0
A. 174
B. 182
C. 186
D. 348
E. 364

【正确答案】 B
【答案解析】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.