Question 318868: Please help me solve how many seconds it will take a car going 45 mph to travel 420 feet. Thank you! Found 3 solutions by Fombitz, JBarnum, solver91311:Answer by Fombitz(32388) (Show Source):
You can put this solution on YOUR website! Rate*Time=Distance
Convert your distance to miles.
420 ft (1 mile/5280 ft)=0.079545 mile hours
1 hr=3600 seconds
t=0.0017677 hrs*(3600 sec/1 hr)=6.36 sec
First convert 45 miles per hour to feet per second. The first step to that conversion is to do a quick calculation in your head so that you will know that the calculated answer is reasonable. Half of 45 rounded down is 22, 22 plus 45 is 67 -- so 67 feet per second is a good estimate of 45 miles per hour. Now do it with the calculator.
Comparing that result to the "in the head estimate" tells us we are on the right track.
Now all you need to do is divide 420 feet by 66 feet per second. I'll leave that arithmetic up to you.
