At 1:00, Jack starts to bicycle along a 60-mile road at a constant speed of 15 miles per hour. Thirty minutes earlier, Scott started bicycling towards Jack on the same road at a constant speed of 12 miles per hour. At what time will they meet?
A. 1:30
B. 3:00
C. 5:00
D. 6:00
E. 9:00
Answer: B
Source: Veritas Prep