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Sue can shovel snow from her driveway in 50 minutes. Bill can do the same job in 40 minutes. How long would it take Sue and Bill to shovel the driveway if they worked together?

Respuesta :

altavistard

Answer:

22 min 13 sec

Step-by-step explanation:

Calculate the following:

      1 clearance                                      1

---------------------------------------- = ---------------------------------  =  22 min 13 sec

1 clearance      1 clearance       1/(50 min)+ 1/(40 min)

------------------ + ------------------

   50 min            40 min

Note:  The LCD here is 200 min.

Also note:  1 / [ 1 / 40 min ] has units "min."

wolf1728

Answer:

It would be:

50 * 40 / (50 + 40) = 2,000 / 90 = 22.222222 minutes

Step-by-step explanation:

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