time=distans/speed...time1=(450/speed1)
time2=450 / (speed1+15)=time1-1
or time1 -time2=1...(450/speed1) -450 /(speed1+15)-1=0
450 -450*[speed1/(speed1+15)] -speed1=0
450*(speed1+15) -450*speed1 -speed1*(speed1+15)=0
-speed1^2 -speed1*15 +15*450=0...or speed1^2 +15*speed1 -6750=0
quadratik equashun giv speed=75 or -90
so me spekt speed1=75 & speed2=90
450/75=6,,,,450/90=5