Driver A passes a milestone at a constant speed of 50 miles per hour. Then, 15 minutes later, Driver B passes the same milestone at a constant speed of 60 miles per hour. If both drivers maintained their speeds and both remained on the highway for at least 2 hours, how long after Driver B passed the gas station did he catch up with Driver A? Choose the correct choice from the following answers:
A) 30 min
B) 45 min
C) 1 hr 15 min
D) 2 hrs
E) 1 hr 30 min
When Driver A is at the station, Driver B is 50/4 miles ahead on the highway. (the distance driven in 15 min)   every hour, Driver B drives 10miles more than Mary. how many hours will it takes him to drive 50/4 miles more? the answer is (50/4)/10 = 25/20=1h15min.   Answer 1 hr 15 min
<result>C</result>
Driver A passes a milestone at a constant speed of 50 miles per hour. Then, 15 minutes later, Driver B passes the same milestone at a constant speed of 60 miles per hour. If both drivers maintained their speeds and both remained on the highway for at least 2 hours, how long after Driver B passed the gas station did he catch up with Driver A?