Question 459655
r*t=d
n=loren
s=lois
t= loren's time
T=lois's time

n*t=200
s*T=100
s=n-10
300=n*(t+T-1/2)
4 equations 4 unknowns

n = 50,   s = 40,   t = 4,   T = 5/2
loren's speed was 50 mph
check
loren
50*4=200
lois
40*5/2=100
loren whole trip
50*(4+5/2-1/2)=300
[50*6=300]
ok