Question
A car travels 120 km at a speed of 40 km/h and then 180 km at a speed of 60 km/h. Find the total time taken and the average speed for the whole journey.
Solution
Time for first part = 120 / 40 = 3 hours Time for second part = 180 / 60 = 3 hours Total time = 3 + 3 = 6 hours Total distance = 120 + 180 = 300 km Average speed = Total distance / Total time = 300 / 6 = 50 km/h Answer: Total time = 6 hours, Average speed = 50 km/h
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