Can anyone help me with this one

[mathdummyjj]

The question is : Joan can shovel a certain driveway in 50 minutes. If Mary can shovel the same driveway in 20 minutes, how long will it take them, to the nearest minute, to shovel the driveway if they work together?


I have no idea what to do can anyone give me explanation in detail, please?

 

[Deleted member 4993]

The question is : Joan can shovel a certain driveway in 50 minutes. If Mary can shovel the same driveway in 20 minutes, how long will it take them, to the nearest minute, to shovel the driveway if they work together?
I have no idea what to do can anyone give me explanation in detail, please?

What FRACTION of the driveway is shoveled in 1 minute - when Joan works alone?

What FRACTION of the driveway is shoveled in 1 minute - when Mary works alone?

What FRACTION of the driveway is shoveled in 1 minute - when Joan+Mary works together (assuming they don't get tangled up working together)?