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Car Wash

Category:Math
Submitted By:blkmagic
Fun:*** (2.27)
Difficulty:** (1.79)



If Bob can wash a car in 8 minutes and Joe can wash a car in 12 minutes, how long would it take to wash the car together?

Answer:

It would take 4 minutes and 48 seconds.

In 1 minute Bob washes 1/8 of the car and Joe washes 1/12 of the car. This makes 3/24ths and 2/24ths of the car washed, or a total of 5/24ths. Therefore the number of minutes taken for a whole car is 24/5, or 4.8 minutes.

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Comments on this teaser


Posted by peterbradfor08/10/01
I disagree with your answer. It would take 4minutes and 48 seconds. Here`s why:- In 1 minute one washes 1/8 of a car and the other 1/12 of a car, i.e. 3/24ths and 2/24ths, or a total of 5/24ths. Therefore the number of minutes taken for a whole car is 24/5, or 4.8 minutes.

Posted by gven08/22/01
i do agree its 4.8 mins

Posted by Smithy12/03/03
i got the same answer as you guys

Posted by Jimbo03/01/05
0.8 of a minute is 0.8 x 60 seconds = 48 seconds. See we all agree! :lol:

Posted by PineappleMama03/19/06
Thank You Little Big League! I knew how to do that one! :D

Posted by dishu05/18/06
I have a suggestion to the editors.Once they have corrected the answer or teaser after the comments, they should remove the comments which pointed the mistakes.It creates confusion for those reading the teaser and comments later.As in this case, the answer is now correctly shown as 4 min 48 sec and comments disagree with the answer saying correct answer is 4.8 min or 4 min 48 sec. so it is confusing for later readers :o

Posted by javaguru01/31/09
Editting the comment isn't very workable, but including the date of the correction might help.




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