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1. A car travels from a point A to point B at constant speed of 50 km/h. On returnjourney along the same path, it travels at a constant speed of 40 km/h. Find itsdistance travelled, displacement and average speed.2 A

Answer»

Let the distance between A and B be x Speed ¹ = 50kmph therefore time taken = x/50

return journey speed ²=40kmphtime taken = x/40

total distance travelled =x+x=2x kmdisplacement =0average speed = total distance/total time= 2x/(x/50+x/40)= 2x÷[ x(40+50)/200]= 2*200/90= 45 kmph



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