Question 978907
<pre>
Two ways to do it.

Method 1: Change 80 mi/h to km/hr then use {{{TIME=DISTANCE/SPEED}}},
then change hours to minutes.

Method 2: Change 200 km to mi/hr then use {{{TIME=DISTANCE/SPEED}}},
then change hours to minutes

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Method 1:

{{{matrix(1,14,80,mi/h,""="",matrix(1,2,80,mi/h),"×",matrix(1,2,5280,ft)/matrix(1,2,1,mi),"×",matrix(1,2,12,in)/matrix(1,2,1,ft),"×",matrix(1,2,2.54,cm)/matrix(1,2,1,in),"×",matrix(1,2,1,m)/matrix(1,2,100,cm),"×",matrix(1,2,1,km)/matrix(1,2,1000,m))}}}

Then cancel all the units that will cancel:

{{{matrix(1,14,80,mi/h,""="",matrix(1,2,80,cross(mi))/h,"×",matrix(1,2,5280,cross(ft))/matrix(1,2,1,cross(mi)),"×",matrix(1,2,12,cross(in))/matrix(1,2,1,cross(ft)),"×",matrix(1,2,2.54,cross(cm))/matrix(1,2,1,cross(in)),"×",matrix(1,2,1,cross(m))/matrix(1,2,100,cross(cm)),"×",matrix(1,2,1,km)/matrix(1,2,1000,cross(m)))}}}

And we have left:

{{{matrix(1,14,80,mi/h,""="",80/h,"×",5280/1,"×",12/1,"×",2.54/1,"×",1/100,"×",matrix(1,2,1,km)/1000)}}} {{{""=""}}}{{{matrix(1,2,128.74752,km/h)}}}

Then use 
{{{TIME=DISTANCE/SPEED}}}{{{""=""}}}{{{matrix(1,2,200,km)/matrix(1,2,128.74752,km/h)}}}{{{""=""}}}{{{matrix(1,2,1.553427981,h)}}}{{{""=""}}}
{{{matrix(1,2,1.553427981,h)/1}}}{{{"×"}}}{{{matrix(1,2,60,minutes)/matrix(1,2,1,h)}}}{{{""=""}}}

cancel the "hours" (h's)

{{{matrix(1,2,1.553427981,cross(h))/1}}}{{{"×"}}}{{{matrix(1,2,60,minutes)/matrix(1,2,1,cross(h))}}}{{{""=""}}}{{{matrix(1,2,93.20567884,minutes)}}}


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Method 2:

{{{matrix(1,14,200,km,""="",matrix(1,2,200,km/1),"×",matrix(1,2,1000,m)/matrix(1,2,1,km),"×",matrix(1,2,100,cm)/matrix(1,2,1,m),"×",matrix(1,2,1,in)/matrix(1,2,2.54,cm),"×",matrix(1,2,1,ft)/matrix(1,2,12,in),"×",matrix(1,2,1,mi)/matrix(1,2,5280,ft))}}}

Then cancel all the units that will cancel:

{{{matrix(1,14,200,km,""="",matrix(1,2,200,cross(km)/1),"×",matrix(1,2,1000,cross(m))/matrix(1,2,1,cross(km)),"×",matrix(1,2,100,cross(cm))/matrix(1,2,1,cross(m)),"×",matrix(1,2,1,cross(in))/matrix(1,2,2.54,cross(cm)),"×",matrix(1,2,1,cross(ft))/matrix(1,2,12,cross(in)),"×",matrix(1,2,1,mi)/matrix(1,2,5280,cross(ft)))}}}

And we have left:

{{{matrix(1,14,200,km,""="",200/1,"×",1000/1,"×",100/1,"×",1/2.54,"×",1/12,"×",matrix(1,2,1,mi)/5280)}}} {{{""=""}}}{{{matrix(1,2,124.2742384,mi)}}}

Then use {{{TIME=DISTANCE/SPEED}}}{{{""=""}}}{{{matrix(1,2,124.2742384,mi)/matrix(1,2,80,mi/h)}}}{{{""=""}}}{{{matrix(1,2,1.553427981,h)}}}{{{""=""}}}
{{{matrix(1,2,1.553427981,h)/1}}}{{{"×"}}}{{{matrix(1,2,60,minutes)/matrix(1,2,1,h)}}}{{{""=""}}}

cancel the "hours" (h's)

{{{matrix(1,2,1.553427981,cross(h))/1}}}{{{"×"}}}{{{matrix(1,2,60,minutes)/matrix(1,2,1,cross(h))}}}{{{""=""}}}{{{matrix(1,2,1.553427981,h)}}}{{{""=""}}}
{{{matrix(1,2,1.553427981,h)/1}}}{{{"×"}}}{{{matrix(1,2,60,minutes)/matrix(1,2,1,h)}}}{{{""=""}}}

cancel the "hours" (h's)

{{{matrix(1,2,1.553427981,cross(h))/1}}}{{{"×"}}}{{{matrix(1,2,60,minutes)/matrix(1,2,1,cross(h))}}}{{{""=""}}}{{{matrix(1,2,93.20567884,minutes)}}}

We get the same answer whichever method we use.

Edwin</pre>