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Sue can sew a pre cut dress in 3 hours. Helen can sew the same dress in 2 hours. if they work together, how long will it take them to complete sewing that dress?

 Feb 24, 2020
 #1
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1 / 3  + 1 / 2 = 1 / T

 

T = 1.2 hours - or 1 hour and 12 minutes.

 Feb 24, 2020
 #2
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its one i think

 Feb 24, 2020
 #3
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Sue   sews  1/3  of the  dress in one  hour

 

Helen  sews   1/2  of the  dress in one hour

 

So.....the portion that they  can sew in one hour  working together  is   

 

1/3  +  1/2  =       5/6              

 

The reciprocal of this  tells us how long  it will take them working together to  complete the  dress  =  6/5 =   1.2  hours

 

 

 

cool cool cool

 Feb 24, 2020

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