If the ratio of the speed of the boat in still water to the speed of the stream is 7 ∶ 5. If the distance of 156 km is travelled downstream in one hour, then find the difference between the speed of the boat in still water and the speed of the stream?
1
36 km/hr
2
16 km/hr
3
26 km/hr
4
14 km/hr
5
27 km/hr