Question 317996
D=RT
70=R*5 AGAINST THE WIND.
R=70/5
R=14 MPH.
110=R*5 WITH THE WIND
R=110/5
R=22 MPH.
(22-14)/2=8/2=4 MPH IS THE SPEED OF THE WIND.
70=(R-4)*5
70=5R-20
5R=70+20
5R=90
R=90/5
R=18 MPH FOR THE CYCLIST IN STILL AIR.
110=(R+4)5
110=5R+20
5R=110-20
5R=90
R=18 DITTO.