maria can shovel snow from her driveway in 35 min. tom can do the same job in 45 min. how long would it take maria and tom to shovel the driveway if they worked together?

Answer 1

The combined rate is
1/35 driveway/min + 1/45 driveway/min
= 0.05079 driveways/min
= 1/19.68 driveways/min

One driveway will take 19.68 minutes to do when they work together.