Originally Posted by
rleungz
"You are travelling at 30 miles an hour. How long to travel 3 miles."
30 mph= 1/2
3 miles/1= 3
3*2= 6 minutes
Thats the method I use for time.
Ric
Or we
know it is 1 mile ever 2 minutes therefore it is 3*2=6
Or 3 miles is 1/10 of 30. 1/10 of 60 is 6 therefore 6 minutes.
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You either work in miles per minute 60=1 etc 420=7, 480=8, 540=9
Or in 6 minute/one tenth of an hour chunks 6, 42, 48, 54 and so on.
thus 12, 18, 24, 30 minutes gives us a times 2, 3, 4 etc.