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Original: 2/4/2008 3:30 PM
Views: 312
Comments: 6
eProps: 2

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2 eProps!2 eProps! 2 eProps from:
digikari4691
Monday, February 04, 2008

 

The Racing Terror

A race car driver doubles his average speed every mile in a 3-mile race.  During the first mile, his average speed is 60 miles per hour.

What is his average speed for the 3 miles?

 Posted 2/4/2008 3:30 PM - 312 Views - 2 eProps - 6 comments

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6 Comments

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140?
Posted 2/5/2008 10:33 AM by digikari4691 - reply

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Noooooo

Much too high.

Mr M

8-)

Posted 2/5/2008 1:53 PM by Math_Guy - reply

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whaaat? (60+120+240)/3
Posted 2/11/2008 1:25 PM by digikari4691 - reply

im gonna have to say 125mph
Posted 2/23/2008 4:57 AM by Anto - reply

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125?  Nope, still too fast.

Think about it......Speed = distance/time.

What is the total distance travelled & how long did it take?

Good Luck

Mr M

Posted 2/24/2008 12:37 AM by Math_Guy - reply

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Give up?

It's just a little slower than 103 mph.(exactly 102 6/7 mph)

How?  Speed = Distance/Time.

Distance is 1+1+1 = 3 miles

Time is 1 minute for the 1st mile + 1/2 min for the 2nd + 1/4 for the 3rd = 1 3/4 or 7/4 min = 7/240 of an hour.

3 divided by 7/240 = 720/7 or 102 6/7 mph

Good luck on the new problem!

Mr M

Posted 4/27/2008 1:38 PM by Math_Guy - reply

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