单选题 A boy walking along a road at 3 kilometers per hour is overtaken by 3 truck traveling at 40 kilometers per hour. If the truck breaks down 1 kilometer beyond where it passes the boy, how many minutes after the breakdown does the boy reach the truck?
【正确答案】 E
【答案解析】[解析] 设该男孩行走1公里所用的时间为分钟,而货车行驶1公里所用的时间为分钟,所以该男孩在故障发生后到达现场所用的时间为: