The ratio between the speed of the boat in still water and the speed of the stream is 10 ∶ 6. The boat covers a distance of 42 km downstream and 34 km upstream and takes total time of 6 hours. Find the downstream speed of the boat.
1
32 km/hour
2
36.22 km/hour
3
25.44 km/hour
4
29.66 km/hour