Gianah lives in Milton. She bought a bus ticket to travel to her cousin's house in Orlando. She gets on the bus in Mobile. The distance between two cities is 300 kilometers and the bus drives 70 kilometers per hour. If the bus is 30 kilometers away from Orlando, which of the following equations represents the hours, h, the bus has travelled?

A. 300 - 70h = 30
B. 300 + 70h = 30
C. 300 + 70h = -30
D. 300 - 70h = -30