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?Solution
Relative speed = 5x – x = 4x km/hr According to the question, 3 = 180/4x So, x = 15 km/hr So, truck A’s speed = x = 15 km/hr and truck B’s speed = 5x = 75 km/hr Sum of the speeds of the 2 trucks = 15 + 75 = 90 km/hr
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