1.

A car covers first 50 km at the speed of 45 km/h and the next 50 km at the speed of 90 km/h. Find the average speed of the car in km/h.

Answer»

-A car covers first 50KM at the speed of 45kmph and the next 50km at the speed of 90kmph.To Find :-Average speed of car during whole journey.Concept :-Average speed of body is defined as RATIO of TOTAL DISTANCE covered to the total time taken.Calculation :-If body covers first HALF of total distance with velocity V1 and secobd half of total distance with velocity V2, then average velocity of body is given by



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