Find the average speed of a boy if he walks 1/3rd distance with a speed of 2 m/sec and rides a bike to cover the remaining distance with a speed of 12 m/s. The total distance is 1.44 km.

1
18.4 km/hr
2
20.5 km/hr
3
15.8 km/hr
4
16.2 km/hr

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