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Abigail can mow a particular lawn in 6 hours, but Bob can do it in only 4 hours. If Abigail and Bob work together, how many minutes would it take them to mow the lawn?

 Jun 29, 2020
 #1
avatar+2152 
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Abigail in 1 hour: 1/6 of the lawn

Bob in 1 hour: 1/4 of the lawn

Together in 1 hour: 1/6 + 1/4 = 5/12 of the lawn

 

They will mow the lawn in 12/5 hours, or 12*12=144 minutes

 Jun 29, 2020
 #2
avatar+28021 
+1

1/6 + 1/4 = 1/x     

  x = 12/5 hr = 144 minutes

 Jun 29, 2020

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