A front end loader has an output of 200 BCY of earth per hour. It loads a fleet of 3 trucks (capacity of 18 LCY each). The trucks haul the earth to a fill where it is compacted with a shrinkage factor of 10%. Each truck has a total cycle time of 15 minutes, assuming no delays. The earth has a swell of 20%. The job requires 18,000 CCY. How many hours are required to excavate and haul the material to the fill

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]