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Jane alone can do the work in 15 days and John alone can do it in 10 days. How many days are needed if Jane and John work together?

 May 29, 2021

Best Answer 

 #1
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Jane rate    1 job / 15 days      John rate =  1 job/10 days

 

together     1 job / ( 1/15 + 1/10)   = 1/ ( 2/30 + 3/30)   = 1/ ( 5/30) = 30 / 5 = 6 days

 May 29, 2021
 #1
avatar+32679 
+2
Best Answer

Jane rate    1 job / 15 days      John rate =  1 job/10 days

 

together     1 job / ( 1/15 + 1/10)   = 1/ ( 2/30 + 3/30)   = 1/ ( 5/30) = 30 / 5 = 6 days

ElectricPavlov May 29, 2021

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