leanagulley99 leanagulley99

23-12-2018
Mathematics

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A train travels 70 kilometers in 4 hours, and then 55 kilometers in 3 hours. What is its average speed?

Respuesta :

wolf1728 wolf1728

23-12-2018

Answer:

Distance = 70 + 55 = 125 kilometers

Time = 4 + 3 = 7 hours

Rate = Distance / Time

Rate = 125 / 7 = 17.8571428571 kilometers per hour

Step-by-step explanation:

Answer Link

23-12-2018

The average speed:

[tex]v=\dfrac{total\ distance}{total time}[/tex]

We have

total distance = 70 km + 55 km = 125 km

total time = 4 h + 3 h = 7 h

The average speed:

[tex]v=\dfrac{125\ km}{7\ km}\approx18\ \dfrac{km}{h}[/tex]

Answer Link

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