Rhia has to travel for 1 hour, in which she travel 40 minutes at speed of 30 km/h and rest 20 minutes at the speed of 4 km/h. Find her average speed.

1
(64/3) km/h
2
(50/3) km/h
3
(200/7) km/h
4
25 km/h
5
None of these

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