Mow a lawn Puzzle | 28 Jun 2009
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Go4Expert Founder
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| 28Jun2009,14:33 | #1 |
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"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?
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Invasive contributor
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| 28Jun2009,16:24 | #2 |
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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) |
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Go4Expert Founder
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| 28Jun2009,16:36 | #3 |
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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 
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~ Б0ЯИ Τ0 С0δЭ ~
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| 28Jun2009,17:17 | #4 |
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Quote:
Originally Posted by shabbir  Congrats mayjune. |
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Invasive contributor
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| 28Jun2009,17:38 | #5 |
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donate my 1$ to the open source please...
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Go4Expert Founder
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| 28Jun2009,20:50 | #6 |
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Quote:
Originally Posted by mayjune |
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Invasive contributor
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| 28Jun2009,20:54 | #7 |
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will do...
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