Question 125492
d=st d=dist, s=speed, t=time
Let Mia's speed be s.
t=d/s
318/(s+7)=276/s
318s=276(s+7)
318s=276s+1932
42s=1932
s=46 mph
46+7=53 mph Richard's speed
.
Check:
318/53=6 hrs
276/46=6 hrs
.
Ed