Question 103137
d=ts d=distance t=time, s=speed
ts=ts
5(s+1.5)=5.5(s-1.5)
5s+7.5=5.5s-8.25
15.75=.5s add -5s+8.25 to each side.
divide each side by .5
s=31.5 km/h
Always check:
5*33=165 km
5.5*30=165 km
Ed