问题
单项选择题
Cars X and Y were traveling together on a straight road at a constant speed of 55 miles per hour when car X stopped for 5 minutes. If car Y continued to travel at 55 miles per hour, how many minutes from the time that car X resumed traveling did it take car X traveling at 60 miles per hour to catch up with car Y ？（） (Assume that the time for car X to slow down and speed up was negligible.)
A.5
B.30
C.45
D.55
E.60
答案
参考答案：D
解析：
设X经过x分钟后追上Y，根据题意可得
。