A Boat Travels Upstream (Against the Current) Between Two Points $10$

Multiple Choice

A boat travels upstream (against the current) between two points on a river $10$ mi apart in $2.5$ hours. The return trip downstream takes only $45$ minutes. What is the boat's speed, and how fast does the current in the river flow?

A) The speed of the boat is $4.5$ Mi/h and the speed of the current flow is about $8.4$ Mi/h
B) The speed of the boat is $8.7$ Mi/h and the speed of the current flow is about $4.7$ Mi/h
C) The speed of the boat is $6.7$ Mi/h and the speed of the current flow is about $8.7$ Mi/h
D) The speed of the boat is $5$ Mi/h and the speed of the current flow is about $4$ Mi/h
E) The speed of the boat is $13.7$ Mi/h and the speed of the current flow is about $6.7$ Mi/h.