Question 277732
D=RT
160=(R+3)T 
T=160/(R+3)
145=RT
T=145/R
SEEING AS THE TIMES ARE THE SAME:
160/(R+3)=145/R CROSS MULTIPLY.
160R=145(R+3)
160R=145R+435
160R-145R=435
15R=435
R=435/15
R=29 MPH FOR DANA'S RATE.
29+3=32 MPH FOR CHUCK'S RATE.
PROOF:
160/32=145/29
5=5