280 is the answer ///////////////////////////////////
4.93
^ This number is less than 5, so we round down to 4.9.
Answer:
Position function is 
Step-by-step explanation:
Given
, since velocity is the antiderivative of acceleration, then
.
Also, since position is the antiderivative of velocity, then
.
D. 50 mph
Going upstream takes longer because of the flow of the water