Your family took 6 hours to travel to your destination. The average speed for the first time 2 h 15 min was 160 km/h. For the remaining trip, the average speed was 180 km/h. How long did it take your family to travel at an average speed of 180km/h?

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).