Posted by Shanda on Saturday, June 7, 2008 at 3:37pm.
figure out how much time it takes for the storm to arrive. Subtract five minutes. Now you have the time for the officer to travel, and you know his distance, so figure speed.
time taken for the storm to arrive = 7.5/30 hrs = .25 hrs = 15 minutes
So the officer must do his 5 miles in 10 minutes to arrive 5 min ahead of the storm
speed = dist./time = 5/(10/60) = 30 mph
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