A boat takes 10 hours 30 minutes to cover a certain distance upstream, while it takes only 5 hours 45 minutes to cover the same distance downstream. What is the ratio between speed of boat and the current?
1
65 ∶ 19
2
84 ∶ 19
3
42 ∶ 23
4
23 ∶ 42
5
45 :13