Ratio of still water speed of a boat to speed of of current is 3:1. It covers 45 km in downstream in X hours and 27 km in upstream in (X + 1/2) hours. Find speed of boat in upstream. 

1
8 km/h
2
9 km/h
3
6 km/h
4
5 km/h
5
11 km/h

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