A particle Travels the first half of its Total distance along a straight line with a speed V kilometre per hour and then next half, with a speed of 60 kilometre per hour if the average speed of the journey is 40 kilometre per hour the value of V is
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Distance covered in time n/2 (1st half)40*n/2=20n
Distance coveredin time n/2 (2nd half)60*n/2=30n
Total distance =(30n+20n)=50n
Time taken=n
Average speed=50n/n=so n cuts n =50km per/h
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