A covers 1 3rd of his journey at the speed of 15km hr and half of the rest of the journey at the spe...........

Quantitative Aptitude ( CCS) Time & distance

A covers 1/3rd of his journey at the speed of 15km/hr and half of the rest of the journey at the speed of 20 km/hr and rest at the speed of 25km/hr. What is the average speed of A?

12 1/2

16 3/14

19 7/47

15 2/5

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Explanation:

Solution:
Let total distance 3x
Total time=x/15 + x/20 + x/25
Average speed =Total distance /Total time
=3x/ ( x/15 + x/20 + x/25)
=3x/(20x+15x+12x/300)
= (3x*300)/ 47x=900/47=19 7/47.