a car journey of 300 km lasts 4 hours. parts of this journey is on a freeway at an average speed of 90km/h. the rest on city roads at an average speed of 70km/h. let T be the time (in hours) spent on the freeway. (a) in terms of T state the number of hours travelling on city roads.(b) state distance travelled on the freeway in terms of T and (c) the distance travelled on each type of road.
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