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Question

A car travels first 30km at a speed of 40km/hr and next 30km at a speed of 20km/hr. Find the average speed of the car


Solution

Average speed = Total distance covered / Total time taken
Time taken to travel the first 40 km = 1 h 
Time taken to travel the next 30 km = 30km /(20 km/h) = 1.5 h
Total distance travelled = 40 + 30 = 70 km
Total time taken = 1 + 1.5 = 2.5 h
Average speed = 70 km/ 2.5 h
                            = 28 km/h

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