You must write a lock that guards access to a shared bathroom. The bathroom may be used by several people at the same time, as long as they are of the same gender; however, mixing genders is never allowed. The data structure representing the lock has been filled in for you, please complete the code. Note: your code must allow for multiple people to use the bathroom, as long as they are of the same gender

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]