Answer:
800 m
Step-by-step explanation:
<h2>SOLVING</h2>

What is the slope of the line passing through the point (1,2) and (5,4)

Formula used, here 
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| simplify
| reduce





Answer:
504km/h
Step-by-step explanation:
there are 60 minutes in an hour.
8.4kmx60min= 504km/h