john can shovel a certain driveway in 50 minutes if mar can shovel the same driveyway in 20 minutes how long will it take them to the nearest minute, to shovel the driveway if they work together
john can shovel a certain driveway in 50 minutes if mar can shovel the same driveyway in 20 minutes how long will it take them to the nearest minute, to shovel the driveway if they work together
What is rate of doing work?