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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 -

    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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