Question 1202485: a train travels 650 km in 12 hours what is the average speed in m/s Found 2 solutions by ikleyn, math_tutor2020:Answer by ikleyn(52781) (Show Source):
We can use the railroad tracks conversion method.
It's named as such because the lines somewhat resemble a railroad track. It's missing one of the metal rails, but you probably get the idea.
This is one way to draw out the railroad conversion diagram.
The placement of each term is to get the following units to cancel: km, hr, min
The goal is to be left with "meters" up top and "seconds" down below.
The first column is our given data.
The last three columns are the equations I mentioned earlier. Eg: 1000 m = 1 km. These equations are either memorized, or written on a reference sheet.
From here we multiply across the top
650*1000*1*1 = 650,000
do the same across the bottom
12*1*60*60 = 43,200
Divide the results
(650,000)/(43,200) = 15.046296 meters per second approximately is the final answer.
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