Mary passed a certain gas station on a highway while traveling west at a constant speed of 50 miles per hour. Then, 15 minutes later, Paul passed the same gas station while traveling west at a constant speed of 60 miles per hour. If both drivers maintained their speeds and both remained on the highway for at least 4 hours, how long after he passed the gas station did Paul catch up with Mary?  Choose the correct choice from the following
A) 2	B) 1.5	C) 1.6	D) 1.7	E) 1.25
d = rt   M: r = 50mph, t = t + 1/4hr   d = 50 (t + 1/4)   P: r = 60, t = t   d = 60t   since they went the same distance:   50t + 50/4 = 60t   10t = 50/4   t = 1.25 or 1 hr, 15min   1.25
<result>E</result>
Mary passed a certain gas station on a highway while traveling west at a constant speed of 50 miles per hour. Then, 15 minutes later, Paul passed the same gas station while traveling west at a constant speed of 60 miles per hour. If both drivers maintained their speeds and both remained on the highway for at least 4 hours, how long after he passed the gas station did Paul catch up with Mary?