SOLUTION: a three person maintenance crew could clean a certain building in 4h, whereas a four person crew could do the job in 3h. if one worker of the four person crew was an hour late, how

Question 1052638: a three person maintenance crew could clean a certain building in 4h, whereas a four person crew could do the job in 3h. if one worker of the four person crew was an hour late, how long did the job take?

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Rate*Time=Output
Say an output of 100 makes the job complete.
.
.
.
For a 3 person crew,

For a 4 person crew,

So for the first hour, it was only a 3 person crew.

So they completed 25 units of output which leaves 75 units to complete.
Now switch to the 4 person rate,

So adding the hour from before,

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