| **calculating speed** | iatola-rocnrola
*Oct 9, 2003 1:12 PM* | | can someone give the math equation for calculating speed. for instance if i did a 23.4 km tt in 47min 23 secs? what was the average speed? |
| **re: calculating speed** | Xeo
*Oct 9, 2003 2:25 PM* | | To calculate km/hour given length and time, you use basic dimensional analysis.
Here is how you set up the problem
Number (km) / number (min) * 60 min / 1 hour = speed/hour
Basically you start off in km per minute and you want km/hour, so you use a conversion factor.
This is what your speed was.
23.4 km / 47 min * 60 min / 1 hour = 29.87 km/hr
If you want miles per hour just divide 29.87/1.6 = 18.66
I rounded the minutes but it is basically accurate.
~Marc |
| **thanks much appreciated...nm** | iatola-rocnrola
*Oct 9, 2003 2:31 PM* | | |
| **(hint - any value divided by 1 is equal to itself). nm.** | Steve_0
*Oct 10, 2003 7:37 AM* | | |
| **re: calculating speed** | collinsc
*Oct 9, 2003 2:26 PM* | | 23 seconds
23/60 = .383 minutes
+ 47 minutes = 47.383 minutes / 60 = .7897 hrs
23.4 km / .7897hrs = 29.63 km/hr = 18.41 mph |
| **More info than you'll ever need...** | coonass
*Oct 9, 2003 3:45 PM* | | http://www.analyticcycling.com/
http://www.tenlinks.com/cycling/science.htm |
| **online calculator here** | Time Trial dot org
*Oct 9, 2003 4:06 PM* | | www.timetrial.org/speed.htm |
| **"per" means "divided by" - kilometers "divided by" hour(s) nm** | BowWow
*Oct 9, 2003 9:59 PM* | | |
| **I think you need more than an equation** | niteschaos
*Oct 10, 2003 5:03 AM* | | Perhaps a trip back to elementary math? Yeah, you'd get alot out of it. Just don't forget your units. mph = miles per hour = miles/hr = Distance/time. I bet your checkbook looks like a mess. |
| **That was uncalled for (nm)** | OffTheBack
*Oct 10, 2003 6:04 AM* | | |
| **aaaarrrrrrrRRRRRRRRRHHHHHHHHHHHHHHHHH** | Steve_0
*Oct 10, 2003 5:42 AM* | | did no-one pay attention in 3rd grade math?
Does no-one understand the significance of the term Miles per hour?
No offence to rocnrola specifically, I just cant fathom how often this question is asked. |
| **speed calculation** | 4bykn
*Oct 10, 2003 1:30 PM* | | This is the formula I use in my spreadsheet:
Miles/(hours+(minutes/60)+(seconds/3600))
or in plain english:
Miles divided by the sum of these three:
1) Hours
2) Minutes divided by 60
3) Seconds divided by 3600 |
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