SOLUTION: A runner runs 80 km per hour after 1 second he was running 90 km per hour what is the average of the runners speed ?

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Question 728440: A runner runs 80 km per hour after 1 second he was running 90 km per hour what is the average of the runners speed ?

Found 2 solutions by Lisalovemath, Alan3354:
Answer by Lisalovemath(2) About Me  (Show Source):
You can put this solution on YOUR website!
First, add both rates of the runners
80+90=170
Then, count the number of rates(this number is very important for the next step).
There are 2.
Now, divide 170 by 2. Dividing the combined rates (170) by the total numbers of rates(2), we will find the average.
170/2=85 kilos per hour.
Thus, the average kph is 85 kph.

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A runner runs 80 km per hour after 1 second he was running 90 km per hour what is the average of the runners speed ?
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If the acceleration from 80 to 90 is constant, his average for that 1 second period is 85 km/hr.
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He's faster than most runners, never seen a human run that fast.