A grader will be used to maintain 2.5 miles of haul road. It is estimated that this work will require light scarifying with two passes in first gear, leveling the road requires two passes in second gear, and final shaping of the road requires three passes in fourth gear. Use an efficiency factor of 60%. Grader speeds are provided in the chart. Estimate the time for this task.

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.