单选题
A plane traveled k miles in the first 96 minutes of flight time. If it completed the remaining 300 miles of the trip in t minutes, what was its average speed, in miles per hour, for the entire trip?
【正确答案】
A
【答案解析】[解析] 考生在做此题时，一定要注意单位的一致，先算出以英里/分钟为单位的平均速度，再把此速度乘以60。该飞机飞行的总距离为k+300英里，总时间为(96+t)分钟，所以根据题意可得其整个旅程的平均速度为[*]。