A horizontal curve on a 4-lane highway (two lanes on each direction with no median) has a superelevation of 6% and a central angle of 40 degrees. The PT of the curve is at station 322+50 and the PI is at station 320+08. The road has 10ft lanes and 8ft shoulders on both sides with high retaining walls going up immediately next to the shoulders. What is the highest safe speed of this curve (highest in 5mph increments) and what is the station of the PC?

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]