A car covers one third of a journey at a speed of 10 kmph and half of the rest at a speed of 20 kmph and the rest at the speed of 30 kmph what is the average speed of the car?

1
14.26 kmph
2
13.86 kmph
3
15.28 kmph
4
16.36 kmph
5
12.76 kmph

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