A man travels first 288 km at a speed 64 km/hr, next 220 km at speed of 40 km/hr and rest of the 288 km at a speed of 48 km/hr. Find the average speed of man in the whole journey.

1
49.75 km/hr
2
40 km/hr
3
55 km/hr
4
42.25 km/hr
5
45.5 km/hr

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