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Guy can mow his entire lawn in 20 minutes; Guy's roommate Lazar needs 30 minutes to mow the entire lawn. If Guy starts mowing at 1 p.m., mows for five minutes and then Lazar starts to help with his own mower, at what time will they finish mowing the lawn?

 Sep 28, 2020
 #1
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In 5 minutes  there will be only 3/4 of the lawn left to mow.

 

Guy can mow 3/4   in 15 min     Lazar can mow 3/4 in   22.5 min

 

1/15   +    1/22.5    = 1/x     solve for x = 9 mins to finish the lawn

 

1:00 pm   + 5 min + 9 min = 1:14 PM

 Sep 28, 2020
 #2
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Aww dang EP got it before me.

 Sep 28, 2020

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