【单选题】The time it took car P to travel 600 miles was 2 hours less than the time it took car R to travel the same distance. If car P's average speed was 10 miles per hour greater than that of car R, what was...
【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...