Question

A train travels 54 kilometers in one hours, and then 85 kilometers in 3 hours. What is its average speed?

Answer 1

Hey there! :D

So, we need to find how many miles would be traveled per hour in the 85 miles in 3 hours time frame.

85/3= 28 1/3

So, we could represent this like a sequence of numbers and find the mean. (which is just the average)


`54, 28 (1)/(3), 28 (1)/(3), 28 (1)/(3)`

Add all the numbers together.


`= 139`

Since this was in a span of four hours. 1+3=4, we can divide this by 4 to find the average.


`139/4= 34.75`

The average was 34.75 miles per hour.

I hope this helps!
~kaikers

Answer 2

Hello there!

You need to use the correct formula for that:

Average speed = total distance/ total time needed

Average speed = (54 + 85)/(1 + 3)

Average speed = 139/4

Average speed = 34.75 kilometers per hour


As always, it is my pleasure to help students like you!