Question 159717
D=RT OT T=D/R
T=180/(R+20)
T=120/R
180/(R+20)=120/R
180R=120(R+20)
180R=120R+2400
180R-120R=2400
60R=2400
R=2400/60
R=40 MPH IS THE RATE OF THE CAR.
40=20=60 FOR THE TRAIN.
PROOF:
180/60=120/40
3=3