SSC JE Electrical Engineering 2013

Question 29

A car covers the first half. of the distance between two places at 40 km/hr and the second half of the distance at 60 km/hr. So what is the average speed of the car?

Solution

Let the total distance be 120 km. 
Hence, first half covered in 60/40 = 1.5 hours and second half covered in 60/60 = 1 hour. 
Total time taken = 2.5 hours to cover 120 km 
Hence, average speed = 120/2.5 = 48 kmph

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