Elen hours after a convict escapes from prison, a guard begins to pursue him if the convict travels at six mph on foot and the guard travels at 72 mph by car, how far from prison will the convict be caught by the guard?

Assuming the convict has been traveling for eleven hours (not "elen" hours), he has gone 66 miles when the guard sets off to catch him. After one hour, the convict has traveled 72 miles, and the guard has traveled 72 hours also. assuming that the guard is travelling in the right direction, the convict is caught 72 miles from the prison.

Yes, two vertical lines can be complementary