Posted by **Katie** on Thursday, October 27, 2011 at 6:35pm.

Lisa can shovel her drive way in 35 minutes. Tom can shovel the same drive way in 40 minutes. How long will it take them to do the job together?

- Help -
**Steve**, Friday, October 28, 2011 at 5:27am
in one minute, Lisa can shovel 1/35 of the driveway

in one minute, Tom can shovel 1/40 of the driveway.

in one minute, they both can shovel 1/35 + 1/40 = 8/280 + 7/280 = 15/280 = 3/56 of the driveway.

So, it will take them 18 2/3 minutes working together.

If b is the time for both,

1/b = 1/35 + 1/40

b = 35*40/(35+40) = 18 2/3

## Answer this Question

## Related Questions

- Word problems - Jenny can shovel snow from her driveway in 60 minutes. Tom can ...
- MATH HEPL - lisa can shovel the drive way in 35 minutes john the same driveway ...
- algebra - I am unsure of what formula to use for this problem can anyone help me...
- Math - Lisa can shovel snow from her driveway in 45 minutes. Bill can do the ...
- algebra 2 - lisa can shovel snow from her driveway in 40 minutes jim can do the ...
- algebra - Sue can shovel snow from her driveway in 40 minutes. Tom can do the ...
- ALGEBRA - Janet can shovel snow from her driveway in 55 minutes. Jim can do the ...
- Algebra - WELL SOMEONE HELP ME SOLVER THIS PROBLEM PLEASE!!!!!! Janet can shovel...
- math - Sue can shovel snow from her driveway in 45 minutes. Bill can do the same...
- math - sue an shovel snow from her driveway in 55 minutes. Bill can do the same ...