SOLUTION: It takes a driver about 3/4 second to begin braking after seeing something on the road. How many feet does a car travel in that time if it is going 10mi/hr? 20mi/hr? 30mi/hr?

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Question 135593: It takes a driver about 3/4 second to begin braking after seeing something on the road. How many feet does a car travel in that time if it is going 10mi/hr? 20mi/hr? 30mi/hr?
Answer by dbashant(7) About Me  (Show Source):
You can put this solution on YOUR website!
These problems are quite easy if you know the trick.
We have miles per hour and we need feet per second.
This requires two conversions, one from miles to feet and one from hours to seconds.
%2810mi%2F1hr%29%2A%285280ft%2F1mi%29%2A%281hr%2F60min%29%2A%281min%2F60sec%29
Notice how the miles, hours and minutes units will cancel each other out, leaving the feet per second.
Simplifying this expression will give us feet per second. Then you must multiply by 3/4 to get the final answer.
Then you should repeat the process for 20mi/hr and 30 mi/hr.