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Sagot :
Answer:
[tex]54\:\mathrm{km/h}[/tex]
Step-by-step explanation:
Average speed is given by [tex]S=\frac{d}{t}[/tex], where [tex]d[/tex] is distance and [tex]t[/tex] is elapsed time.
Since we want the average speed of the entire trip, we need to total distance of the entire trip and the total time it takes for the entire trip.
What we know:
- The trip took 2 hours (2:30 PM to 4:30 PM)
- The bus travelled [tex]22.5+42.8+42.7=108[/tex] kilometers
Substituting known values, we get:
[tex]S_{avg}=\frac{108\:\mathrm{km}}{2\:\mathrm{h}}=\boxed{54\:\mathrm{km/h}}[/tex]
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