Question

A number of dump trucks are used to haul asphalt from the plant to the road construction project. The estimated cycle time for the trucks is 55 minutes. The trucks carry 15 tons of asphalt per trip. Using a system efficiency of 50 minutes per hour and productivity factor of 1.1, determine the number of labor hours required to haul one ton of asphalt. Each truck requires one operator.

Answer 1

Answer: 0.081 hrs of labour

Explanation:

Given

cycle time= 55 min

quantity allowed per cycle= 15 tons

productivity factor= 1.1

operator size= 1

systrem efficiency= 50mins

Number of labour hours is defined as the Productivty rate which describes The overall output produced in an hour of work.  Since the productivity rate gives us the labour hours, we will use it to calculate

Productivity Rate == Average cycle time x Productivity factor x  operator size / efficiency of the system x quantity allowed per cycle

substituting the values into the equation gives

PRODUCTIVITY RATE== 55 X 1.1X 1/ 50X 15

changing mins to hours

60 mins = 1 hr

55mins= 55/60=0.916667hrs

50 mins=0.83333hrs

=0.916667hrs x 1.1 x 1/ 0.833333x 15

==0.08067 = 0.081 hrs of labour