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-   -   Mow a lawn Puzzle | 28 Jun 2009 (http://www.go4expert.com/contests/mow-lawn-puzzle-28-jun-2009-t18236/)

shabbir 28Jun2009 14:33

Mow a lawn Puzzle | 28 Jun 2009
 
"A" can mow a lawn in 2 hours while "B" can do so in 2.5 hours separately. If A & B work together, how long will it take for them to mow the lawn?

mayjune 28Jun2009 16:24

Re: Mow a lawn Puzzle | 28 Jun 2009
 
Ans is 1.112 hours (aprox)

Lets say the lawn is 1000 sq mts
A takes 1000/120 mins i.e. in one min = 8.334 mts
B takes 1000/150 mins i.e. in one min = 6.667 mts
Total time = x
6.66x + 8.33x = 1000
x = 66.67 (aprox)
Therefore 1.112 hours (aprox)

shabbir 28Jun2009 16:36

Re: Mow a lawn Puzzle | 28 Jun 2009
 
In 1 hour, A can mow 1/2 the lawn.
In 1 hour, B can mow 2/5 of the lawn.
Together in 1 hour, they can mow 1/2 + 2/5 = 9/10 of the lawn.
So to complete the lawn mowing, it will take them 10/9 hours.

Its rare we have a Winner before a post from Saswat :D

SaswatPadhi 28Jun2009 17:17

Re: Mow a lawn Puzzle | 28 Jun 2009
 
Quote:

Originally Posted by shabbir (Post 50645)
Its rare we have a Winner before a post from Saswat :D

Actually, I have already reached the limit : 3 wins/week. So I was not actually waiting for Today's puzzle. ;)

Congrats mayjune.

mayjune 28Jun2009 17:38

Re: Mow a lawn Puzzle | 28 Jun 2009
 
donate my 1$ to the open source please...

shabbir 28Jun2009 20:50

Re: Mow a lawn Puzzle | 28 Jun 2009
 
Quote:

Originally Posted by mayjune (Post 50652)
donate my 1$ to the open source please...

Will do that. And as always if you have any open source projects please do let me know.

mayjune 28Jun2009 20:54

Re: Mow a lawn Puzzle | 28 Jun 2009
 
will do...


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