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Debbie’s Dragster

Debbie starts driving her dragster from rest and constantly accelerates to 60 mph in 10 seconds. How far does she travel in those 10 seconds?

1/12 mile

Ten seconds is 1/6 of a minute and 1 minute is 1/60 of an hour, so 10 seconds is 1/360 of an hour.

If you graph her trip with the speed on the y-axis and the time on the x-axis, you get a triangle with height of 60 mph and width of 1/360 of an hour. To calculate the area of the triangle, you multiply 1/2 × 1/360 × 60 = 1/12.

Posted in Brain Teasers


3 Comments on "Debbie’s Dragster"

kelechi says
May 20, 2016 @ 11:54

6 miles

froggie123 says
May 24, 2016 @ 01:50

?! I did not get that one at all!

Ellie says
October 27, 2017 @ 09:57

Too many math riddles. My brain does not like numbers!

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