Question
A car travels 90 km at a speed of 30 km/h and then 150
km at a speed of 50 km/h. Find the total time taken and the average speed for the whole journey.Solution
Time for first part = 90 / 30 = 3 hours Time for second part = 150 / 50 = 3 hours Total time = 3 + 3 = 6 hours Total distance = 90 + 150 = 240 km Average speed = Total distance / Total time = 240 / 6 = 40 km/h Answer: Total time = 6 hours, Average speed = 40 km/h
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