A person covers a distance of first 120m at a speed of 4m/sec , next 120m at a speed of 5m/sec and final distance of 120m at 6m/sec, then during the complete journey, find his average speed in km/ hour
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average distance= sum of values/no. of values
4+5+6/3
=15/3
=5m/sec
5m/sec =1080km/hr
average speed of car is 1080km/hr
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