Question 205999
D=RT OR T=D/R
T=.9/(R+1.5)
T=.6/(R-1.5)
.9/(R+1.5)=.6/(R-1.5)
.6(R+1.5)=.9(R-1.5)
.6R+.9=.9R-1.35
.6R-.9R=-1.35-.9
-.3R=-2.25
R=-22.5/-.3
R=7.5 MPH IS HIS QWIMMING SPEED IN STILL WATER.
PROOF:
.9/(7.5+1.5)=.6/(7.5-1.5)
.9/9=.6/6
.1=.1