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The diagram shows the miles traveled by bikers Alberto and Bjorn. After four hours, about how many more miles has Alberto biked than Bjorn?
[asy] for (int a = 0; a < 6; ++a) { for (int b = 0; b < 6; ++b) { dot((4*a,3*b)); } } draw((0,0)--(20,0)--(20,15)--(0,15)--cycle); draw((0,0)--(16,12)); draw((0,0)--(16,9)); label(rotate(30)*"Bjorn",(12,6.75),SE); label(rotate(37)*"Alberto",(11,8.25),NW); label("

0

",(0,0),S); label("

1

",(4,0),S); label("

2

",(8,0),S); label("

3

",(12,0),S); label("

4

",(16,0),S); label("

5

",(20,0),S); label("

0

",(0,0),W); label("

15

",(0,3),W); label("

30

",(0,6),W); label("

45

",(0,9),W); label("

60

",(0,12),W); label("

75

",(0,15),W); label("H",(6,-2),S); label("O",(8,-2),S); label("U",(10,-2),S); label("R",(12,-2),S); label("S",(14,-2),S); label("M",(-4,11),N); label("I",(-4,9),N); label("L",(-4,7),N); label("E",(-4,5),N); label("S",(-4,3),N);[/asy]

\text{(A)}\ 15\qquad\text{(B)}\ 20\qquad\text{(C)}\ 25\qquad\text{(D)}\ 30\qquad\text{(E)}\ 35

Problem Statement