选择题
1999 AMC 8 Problem 4: Biker Distance Graph
The diagram shows the miles traveled by bikers Alberto and Bjorn. After four hours, about how many more miles has Alberto biked than Bjorn? In the graph, Alberto is at about 60 miles after 4 hours, while Bjorn is at about 35 miles after 4 hours.
A.
15
B.
20
C.
25
D.
30
E.
35