Question

Truck A is traveling at a speed of x km/hr, and Truck B is moving in the same direction but is 180 km behind Truck
A. The speed of Truck B is 5x km/hr. If it takes Truck B 3 hours to catch up with Truck A, what is the sum of the speeds of both trucks?

A 90 km/hr
B 60 km/hr
C 75 km/hr
D 50 km/hr
E None of these
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