In minutes, how much LONGER would it take plane B to travel 300 miles than it would take plane A to travel the same distance?

City Commuter Airplane Service is considering the purchase of another airplane for its fleet.

The cruising speeds of the two choices are shown in the graph below.

In minutes, how much LONGER would it take plane B to travel 300 miles than it would take plane A to travel the same distance?
A . 20
B . 30
C . 40
D . 60
E . 75

Answer: B