Truck P and Truck Q drive on the highway in the same direction at respective rates of 72 kph and 80 kph. If Truck Q is 5 km behind Truck P, by how much does Truck P need to increase the speed to catch up with Truck P in 30 minutes?	Choose the correct choice from the following answers.
A) 2 kph
B) 4 kph
C) 6 kph
D) 8 kph
E) 10 kph
Truck Q needs to gain 5 km in 30 minutes.   The relative speed difference needs to be 5 km / 30 minutes = 10 km/hour   Truck Q needs to increase up to 82 kph, thus an increase in 2 kph.   The answer is 2 kph.
<result>A</result>
Truck P and Truck Q drive on the highway in the same direction at respective rates of 72 kph and 80 kph. If Truck Q is 5 km behind Truck P, by how much does Truck P need to increase the speed to catch up with Truck P in 30 minutes?