Question
A man travels 60 km at a speed of 30 km/h and then
travels 90 km at a speed of 60 km/h. What is his average speed for the entire journey?Solution
Time taken for the first part = Distance / Speed = 60 / 30 = 2 hours. Time taken for the second part = Distance / Speed = 90 / 60 = 1.5 hours. Total distance = 60 + 90 = 150 km. Total time = 2 + 1.5 = 3.5 hours. Average speed = Total distance / Total time = 150 / 3.5 = 42.86 km/h. Correct option: a) 42.8 km/h
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