Question 999333
distance = velocity * time
Alan is 55t, where t=hours
Allie is 65(t-1), since she started an hour later.
They add to 250 miles
mph/hr=miles (units)
55t+65t-65=250
120t=315
t=2.625 hours for A. (144.375 miles)
T=1.625 hours for All.(105.625 miles)
miles add to 250.
They can talk for 2.625 hours, assuming time is started when Alan leaves.  Once they are both driving, they can talk for 1.625 hours.  The question is ambiguous there.