Question 398541
D=RT
60=(X+6)T MARIA'S RIDE
T=60/(X+6) 
42=XT PRARDUP'S RIDE
T=42/X
60/(X+6)=42/X
42(X+6)=60X
42X+262=60X
42X-60X=-262
-18X=-262
X=-262/-18
X=14 KPH FOR PRAEUR'S SPEED.
14+6=20 KPH FOR MARIA'S SPEED.
PROOF:
60/20=42/14
3=3