Question

Working alone, it would take Shandra 40 minutes to sand a table. To sand the same table, also working alone, it would take

Answer 1

Answer:

1/40+1/60=1/t  is best  describes Shandra's claim.

Step-by-step explanation:

Finding average of both Shandra and Kelly working time is wrong way to find the time taken when they both work together. The correct way to find time taken when they both work together is:

$\frac{1}{40} +\frac{1}{60} =\frac{1}{t}$

$\frac{3 + 2}{120} = \frac{5}{120} =\frac{1}{t}$

$t=24$

Hence, When both Shandra and Kelly are working together they take 24 minutes to complete the work.

Answer 2

Answer:  it will take them about 24 minutes working together

Step-by-step explanation:

1/40    +   1/60 =

6/240 +  4/240 = 10/240 = 1/24

1/24 = 1/t

Cross multiplication:

1*t = 1*24  

t= 24