Mow a lawn Puzzle | 28 Jun 2009

shabbir's Avatar, Join Date: Jul 2004
Go4Expert Founder
"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's Avatar, Join Date: Jun 2009
Invasive contributor
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's Avatar, Join Date: Jul 2004
Go4Expert Founder
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
SaswatPadhi's Avatar, Join Date: May 2009
~ Б0ЯИ Τ0 С0δЭ ~
Quote:
Originally Posted by shabbir View Post
Its rare we have a Winner before a post from Saswat
Actually, I have already reached the limit : 3 wins/week. So I was not actually waiting for Today's puzzle.

Congrats mayjune.
mayjune's Avatar, Join Date: Jun 2009
Invasive contributor
donate my 1$ to the open source please...
shabbir's Avatar, Join Date: Jul 2004
Go4Expert Founder
Quote:
Originally Posted by mayjune View Post
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's Avatar, Join Date: Jun 2009
Invasive contributor
will do...