SOLUTION: How many minutes will it take for a car that is traveling 80 mi/h to travel 200 km ?

Two ways to do it.

Method 1: Change 80 mi/h to km/hr then use ,
then change hours to minutes.

Method 2: Change 200 km to mi/hr then use ,
then change hours to minutes

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Method 1:



Then cancel all the units that will cancel:



And we have left:

 

Then use 



cancel the "hours" (h's)




 ------------


Method 2:



Then cancel all the units that will cancel:



And we have left:

 

Then use 


cancel the "hours" (h's)




cancel the "hours" (h's)



We get the same answer whichever method we use.

Edwin