A man completes a certain journey by a car If he covered 30 of the distance at the speed of 20kmph 6...........

Quantitative Aptitude ( CCS) Time & distance

A man completes a certain journey by a car. If he covered 30% of the distance at the speed of 20kmph. 60% of the distance at 40km/h and the remaining of the distance at 10 kmph, his average speed is:

36km/hr

28km/hr

16km/hr

25km/hr

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Explanation:

Solution:
Let the total distance be 100 km.
Average speed = total distance covered/ time taken
= 100/[(30/20)+(60/40)+(10/10)]
= 100/[(3/2)+(3/2)+(1)]
= 100/[(3+3+2)/2]
= (100*2)/8
= 25 kmph.