Question
A person travels 60 km at a speed of 30 km/h and then 90
km at a speed of 45 km/h. Find the total time taken and the average speed for the whole journey.Solution
First part time = 60 / 30 = 2 hours Second part time = 90 / 45 = 2 hours Total distance = 60 + 90 = 150 km Total time = 2 + 2 = 4 hours Average speed = Total distance / Total time = 150 / 4 = 37.5 km/h Answer: Total time = 4 hours; Average speed = 37.5 km/h.
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