chandlerwilliam chandlerwilliam

27-02-2018
Physics

contestada

A train travels 67 kilometers in 1 hours, and then 81 kilometers in 5 hours. What is its average speed?

Respuesta :

Edufirst Edufirst

27-02-2018

Answer: 24.7 km/h

Explanation:

1) Average speed definition and formula

The average speed is the total distance run divided by the time elapsed:

S = distance / time

2) Distance 1 = 67 km

3) Distance 2 = 81 km

4) Total distance traveled = 67 km + 81 km = 148 km

5) time 1 = 1 hour

6) time 2 = 5 hours

7) total time = time 1 + time 2 = 1 h + 5 h = 6 h

8) Average speed:

S = 148 km / 6 h = 24.7 km/h

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