A Ford Truck Enters a Highway and Travels at a Uniform

A Ford truck enters a highway and travels at a uniform speed of 50 mph.Half an hour later a Jaguar enters the highway at the same junction and heads in the same direction at 55 mph.How long after the Ford entered the highway does the Jaguar catch up with the truck?

A) 5.0 hrs
B) 6.0 hrs
C) 1.0 hrs
D) 1.6 hrs
E) 5.5 hrs