On Monday, Hank drove to work at an average speed of 70\:km/h and arrived 1 minute late. On Tuesday, he left at the same time and took the same route. This time he drove at an average speed of 75\:km/h and arrived 1 minute early. How long is his route to work?
Answer Choices
A. 30\:km
B. 35\:km
C. 45\:km
D. 50\:km
E. 60\:km