Final answer:
Public transit buses powered on EMER PWR have backup batteries or generators to supply power in emergencies. The duration the battery will last depends on its capacity and the power consumption of the bus systems. To estimate the duration, divide the battery capacity by the power consumption per bus.
Step-by-step explanation:
Public transit buses powered on EMER PWR are those that have an emergency power system that allows them to continue operating in case of a power outage or other emergencies. These buses have backup batteries or generators that can supply power to vital systems such as lighting, communication equipment, and emergency braking.
The duration for which the battery will last depends on various factors, including the capacity of the battery, the power consumption of the bus systems, and the level of energy stored in the battery when the emergency power is activated. Without specific information about the battery capacity and power consumption of the buses, it is difficult to provide an exact duration.
However, with a total demand of 60 MW and an average rate of 150 kW per bus, we can estimate that each bus requires approximately 400 kWh of power. To determine how long the battery will last, we would need to know the capacity of the battery in kilowatt-hours. Once we have that information, we can divide the battery capacity by the power consumption per bus to find the approximate duration.