Posted by thomas on Sunday, September 2, 2012 at 5:04pm.
A person travels by car from one city to another with diﬀerent constant speeds between
pair of cities. She drives for 31.5 min at
89.6 km/h, 11.8 min at 101.8 km/h, and
58.5 min at 36.4 km/h, and spends 24.8 min
eating lunch and buying gas.
Find the distance between the initial and
ﬁnal cities along this route.
Answer in units of km

physics  Henry, Tuesday, September 4, 2012 at 11:17pm
Dt=89.6km/60min*31.5min+
101.8km/60min*11.8min+36.4km/60min*58.5=
Tot. Dist.
T = t1 + t2 + t3 + t4. = Tot. min.
T/60min/h = T in hours.
r(avg) = Dt/T