HolleyHillgp5086
Short answer: 45 minutes
Explanation: We're going to use proportions to figure this out. We have a known proportion of 12 km per 60 minutes (one hour) which we'll represent as 12/60. We then have a similar proportion with 9 km of unknown time which we'll represent as 9/X. We know these two proportions are equal so we end up with the equation:
12/60 = 9/x
Now we simplify:
12/60 = 9/X
12X = 9*60
12X = 540
X = 45
So now we know the proportion is 9 km per 45 minutes. We can also say that the runner can run 9km in 45 minutes.
Wiki User
∙ 8y ago26
126,720 of them.
The runner would be running at 6.67 miles per hour. This is answered by dividing 60 (minutes in an hour) by 9 (minutes it took for one mile). You are basically saying that the runner will run a mile every 9 minutes, so how many '9 minutes' (each mile ran) are in an hour.
she must ruv 70 minutes
That depends at what speed you are travelling.
5
4 miles
26.2
The answer depends on the distance for the race. A marathon runner could not maintain the speed attained by a sprint runner.
The answer depends on the distance for the race. A marathon runner could not maintain the speed attained by a sprint runner.
25min
About 7 minutes and 30 seconds.
26
3 hours
It will take him two (1.98) minutes.
15 minutes.
10,000 / 400 = 25