1.

A car covers first half of the distance between two places at a speed of 40km/hr and the second half at 60km/hr. Calculate the average speed of the car

Answer»

Average SPEED of the car = 48 km/hStep by step explanations :Given that,A car covers first half of the DISTANCE between two places at a speed of 40km/hr and the second half at 60km/hrlet the total distance be 2dhere,TIME TAKEN to cover d at 40 km/h= d/40time taken to cover d at 60 km/h = d/60Average speed =total distance covered/total time taken total distance covered = 2dtotal time taken = d/40 + d/60= (3d + 2d) /120= 5d/120= d/24 hso, Average speed = 2d/(d/24)= 48d/d= 48 km/hso, Average speed of the car = 48 km/h



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