Medha covers 81 km at a speed of 27 km/h by bike, 12 km at a speed of 6 km/h by bicycle, and another 270 km at a speed of 45 km/h by car. Find her average speed for the whole journey. 

1
33 km/h
2
36 km/h 
3
34 km/h 
4
35 km/h

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