Comprehension Passage
Directions: The following caselet shows the speed of three boats while traveling between two ports X and Y
Three boats A, B, and C traveling between ports X and Y which are 60 km apart. The ratio of the speed of the boats A and B in still water is 2 : 3. The ratio of speed of the boat A while traveling upstream to the speed of boat C while traveling downstream is 1 : 5. The speed of boat B while traveling downstream is twice of its speed while traveling upstream. The speed of the stream is 5 km/hr. While traveling port X to port Y the boats travel against the stream, and while traveling from port Y to port X they travel along with the stream.
A new boat D is added in the port. The speed of boat D in still water is 80% of the sum of the speed of B and C together in still water. Find the ratio of the speed of boat D while traveling downstream to the speed of boat A while traveling downstream.
1
5 : 11
2
11 : 5
3
3 : 5
4
3 : 2
5
2 : 3