Question 248643
D=RT OT T=D/R
8=45*2/R
8=45/(R+3)+45/(R-3)
8=(45R-135+45R+135)/(R+3)(R-3)
8=(90R)/(R^2-9)
8(R^2-9)=90R
8R^2-72-90R=0
8R^2-90R-72=0
(2R-24)(4+3)=0
2R-24=0
2R=24
R=12 MPH. IS THE SPEED OF THE BOAT.
PROOF:
8=45/(12+3)+45/(12-3)
8=45/15+45/9
8=3+5
8=8