Problem of the Day

Chapter 1, Lesson 1

During on-peak hours, a train leaves Ardsley Station every 15 minutes from 6:30 a.m. through 9:00 a.m. During off-peak hours, a train leaves that station every half hour from 9:30 a.m. through 3:30 p.m. Which time span has the greater number of trains? How many more? (7-1)