Question 102249
5m/s
4.5m/s
d=st d=distance s=speed t=time
st=st
5t=4.5(t+2.5)
5t=4.5t+11.25
.5t=11.25 subtract 4.5t from each side.
t=11.25/.5 divide each side by .5
t=22.5 sec. Ans
Check:
5*22.5=112.5 m (dist of race)
4.5(22.5+2.5)=4.5*25=112.5 m
Ed