GMAT Problem Solving
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Source: GWD
Level: 4
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 2 hours, how long after he passed the gas station did Paul catch up with Mary?
- A 30 min
- B 45 min
- C 1 hr
- D 1 hr 15 min
- E 1 hr 30 min