A boat running up stram takes 6 hours to cover a certain distance, while it takes 9 hours to cover the same distance running down stream. what is the ratio between the speed of the boat and the speed of water current respectively?	Options.
A) 2 : 3  B) 5 : 1  C) 4 : 5  D) 7 : 1  E) 8 : 1
Explanation:   Let speed of boat is x km/h and speed stream is y km/hr   6(x+y) = 9(x-y)   6x+6y = 9x-9y   15y = 3x   5y = x   x/y = 5/1   5 : 1   Answer: Option 5 : 1
<result>B</result>
A boat running up stram takes 6 hours to cover a certain distance, while it takes 9 hours to cover the same distance running down stream. what is the ratio between the speed of the boat and the speed of water current respectively?