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A person travels from X to Y at a speed of 40 kmph and returns by increasing his speed by 50%. What is his average speed for both the trips ?
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Speed from x to y= 40 kmph speed from y to x = 40+40*(50/100) = 60 kmph So average speed of total journey = (2*40*60)/(40+60)= 48 kmph
Out of three annual examinations,each with a total of 500 marks,a student secured avreage marks,of 45% and 55% in the first and second
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