On 4 Aug 2002 at 10:43, Bob Stevens wrote:

> http://javascript.internet.com/calculators/distance-speed-time.html
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Bob gives a valuable URL.  On my last trip to Michigan I was driving alone
and had nothing better to do than do the math.  We use Miles/hour or
Km/hour. Each hour has 3600 seconds (60 minutes X 60 seconds/minute).  I
decided to use the mile (or km) as the base unit due to the super highways
having mile (km) markers along  the side of the road.   So I figures out
that it should take me 1 minute between mile markers to go 60 mph (in the
USA) or in the rest of the world, it should take me 36 seconds to go 1 km
(3600 seconds /100 km).  In my CDN 91 syncro westy, I have to go 110 kph
by the speedometer to make it from one km post to the next km post in 36
seconds.  Here is a table that I just made up in my spreadsheet (I hope
this is correct):

MPH     seconds/min
60      3600    60.0    seconds per mile
65      3600    55.4    seconds per mile
70      3600    51.4    seconds per mile
75      3600    48.0    seconds per mile
80      3600    45.0    seconds per mile
85      3600    42.4    seconds per mile
90      3600    40.0    seconds per mile
95      3600    37.9    seconds per mile
100     3600    36.0    seconds per mile
105     3600    34.3    seconds per mile
110     3600    32.7    seconds per mile
115     3600    31.3    seconds per mile
120     3600    30.0    seconds per mile

KPH
70      3600    51.4    seconds per km
80      3600    45.0    seconds per km
90      3600    40.0    seconds per km
100     3600    36.0    seconds per km
110     3600    32.7    seconds per km
120     3600    30.0    seconds per km
130     3600    27.7    seconds per km
140     3600    25.7    seconds per km

Enjoy.  Malcolm