mark and rachel work for smith comp. mark can finish a job in 4 hours while it takes rachel 3 for same job. if mark and rachel work together and smith comp. charges 40 dollars per hour for a two person crew, then how much will smith comp. charge for the job?

unrealistic that a women finishes the job earlier than the man but solve anyway

100 fg for all the work included

Mark can do (1/4) of the job in an hour.
Rachel can do (1/3) of the job in an hour.

In one hour working together, Mark and Rachel can do (1/3) + (1/4) = (4/12) + (3/12) = (7/12) of the job in an hour.

(7/12) job per hour * x hours = 1 full job

x = 12/7 hours

$40/hr * (12/7) hr = $68.57

thanks

2+2-1=3

quick maffs