Homework Help: ALGEBRA

Posted by GGIFT on Wednesday, March 10, 2010 at 6:47am.

Janet can shovel snow from her driveway in 55 minutes. Jim can do the same job in 35 minutes.

How long would it take Janet and Jim to shovel the driveway if they worked together? ____ minutes ??

ALGEBRA - Reiny, Wednesday, March 10, 2010 at 8:11am
Janet's rate = DW/55
Jim's rate = DW/35

combined rate = DW/55 + DW/35 = 18DW/385

time working together = DW/(18DW/385)
= 385/18
= 21.39 minutes or 21 minutes 23 seconds

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