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January 27, 2015

January 27, 2015

Posted by **Lindsay** on Friday, November 30, 2012 at 12:54am.

Calculate the speed limit.

- math -
**kay**, Friday, November 30, 2012 at 4:12amIf he travels at 120 Km per hour in 30'(ie 1/2 hour) he did 120/2=60Km.

If he travels at max speed allowed he takes 30+20=50'or 50/60=5/6 hours to reach his destination. so speed is: 60/(5/6)= 360/5=72Km/h

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