A boat running up stram takes 6 hours to cover a certain distance, while it takes 7 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?	Pick one:
A) 2 : 3
B) 5 : 6
C) 4 : 5
D) 13 : 1
E) 8 : 1
Explanation:   Let speed of boat is x km/h and speed stream is y km/hr   6(x+y) = 7(x-y)   6x+6y = 7x-7y   13y = x   13y = x   x/y = 13/1   13 : 1   Answer: Option 13 : 1
<result>D</result>
A boat running up stram takes 6 hours to cover a certain distance, while it takes 7 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?