Question

Asked Nov 21, 2019

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A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 45.0 min at 70.0 km/h, 9.0 min at 55.0 km/h, and 40.0 min at 60.0 km/h and spends 15.0 min eating lunch and buying gas.

(a) Determine the average speed for the trip.

(b) Determine the distance between the initial and final cities along the route.

Step 1

Let the speed of the car in the first three interval is denoted by *v _{1}*,

Let *t _{b}* be the time spent in eating and buying gas.

Step 2

(b) Use the speed-distance formula and plug the suitable values to determine the total distance(*Δx*) between final and the initial cities.

Step 3

Find the total time(*Δt*) ...

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