Brain Teasers
Race Driver
A racing driver drove around a 6-mile track at 140 miles per hour for 3 miles, 168 miles per hour for 1.5 miles, and 210 miles per hour for 1.5 miles. What was his average speed for the entire 6 miles?
Answer
160mphHide Answer Show Answer
What Next?
View a Similar Brain Teaser...
If you become a registered user you can vote on this brain teaser, keep track of which ones you have seen, and even make your own.
Solve a Puzzle
Comments
Isn't someone supposed to be making sure that duplicate teasers aren't posted? I've already seen this teaser, only the numbers were different. Maybe I'll submit the same teaser but make the track FIVE miles long this time - that'll fool 'em.
I got 164.5...
How did this get approved?
140*3/(3+1.5+1.5) = 70
168*1.5/(3+1.5+1.5) = 42
210*1.5/(3+1.5+1.5) = 52.5
70+42+52.5 = 164.5
140*3/(3+1.5+1.5) = 70
168*1.5/(3+1.5+1.5) = 42
210*1.5/(3+1.5+1.5) = 52.5
70+42+52.5 = 164.5
To post a comment, please create an account and sign in.
Follow Braingle!