Question
A cyclist travels from town A to town B at a speed of 20
km/h and returns to town A at a speed of 30 km/h. If the total distance between the towns is 120 km, what is the average speed of the cyclist for the entire journey?Solution
Time taken to travel from A to B = Distance / Speed = 120 / 20 = 6 hours. Time taken to travel from B to A = Distance / Speed = 120 / 30 = 4 hours. Total distance = 120 + 120 = 240 km. Total time = 6 + 4 = 10 hours. Average speed = Total distance / Total time = 240 / 10 = 24 km/h. Correct answer: A) 24 km/h
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