Aperson travels by car from one city to another with different constant speeds between pairs of cities. she drives for 25.0 min at 95.0 km/h, 16.0 min at 100.0 km/h, and 50.0 min at 40.0 km/h and spends 30.0 min eating lunch and buying gas. determine the average speed for the trip.

49.8 km/h

Explanation:

We can determine the average speed by calculating the total distance covered and the time taken,

- First part of the trip:

v1 = 95.0 km/h = 26.4 m/s

t1 = 25.0 min = 1500 s

Distance covered:

- Second part of the trip:

v2 = 100.0 km/h = 27.8 m/s

t2 = 16.0 min = 960 s

Distance covered:

- Third part of the trip:

v3 = 40.0 km/h = 11.1 m/s

t3 = 50.0 min = 3000 s

Distance covered:

The person also spend 30.0 min without moving:

t4 = 30.0 min = 1800 s

Total distance covered:

Total time taken:

So, the average speed is

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