Question 381458
D=RT
450=RT
T=450/R
300=(R-30)T
T=300/(R-30)
450/R=300/(R-30)
300R=450(R-30)
300R=450R-13,500
300R-450R=13.500
-150R=-13,500
R=-13,500/-150
R=90 KMH FOR THE TRAIN
90-30=60 KMH.
PROOF:
450/90=300/60
5=5