Quantitative Aptitude Speed Time and Distance Boat and River

The speed of a boat in still water is 15 km/hr. If it can travel 42 km downstream and 28 km upstream in the same time, then what is the speed of the stream ?  

1
2.5 km/hr 
2
3 km/hr 
3
4.5 km/hr  
4
6 km/hr 

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