Homework Help: physics

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

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