Neeraj reaches school in a car at at an average speed of 20 km per hour while returning is speed become 30 km per hour due to lasser crowd what is the average speed of Neeraj car for the whole journey
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let the distance be x
speed = d/t×2
30-d/t×2
t×2=d /30
average speed =Total distance by total time taken
20 =d/t
2d/3d/120
2d×120/3d
80
kilometre per hour
speed = d/t×2
30-d/t×2
t×2=d /30
average speed =Total distance by total time taken
20 =d/t
2d/3d/120
2d×120/3d
80
kilometre per hour
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