Question 32727
Let the time taken to do the job by Mark and Rachel together be t hours
Mark does t/2 portion of the job;
Rachel does t/4 portion of the job;
Mark's portion + Rachel's portion = 1
=> t/2 + t/4 = 1
=> 2t+t = 4
=> t = 4/3;
Time taken by Smith Landscaping Company to finish the job is 4/3 hours.
Cost of labour is $45 per hour; cost for 4/3 hours = 45(4/3) = $60.
Answer: $60.00