Explanation: To determine how long the battery can supply power, first calculate the total power consumption of both units. The transmitter uses 325 watts and the receiver uses 50 watts, for a total of 325 W + 50 W = 375 W. Next, calculate the total current drawn from the battery using the formula Power (P) = Voltage (V) * Current (I). Rearranging for current: I = P / V. I = 375 W / 12.6 V ≈ 29.76 Amperes. Finally, calculate the battery's run time by dividing its ampere-hour rating by the total current drawn: Run Time (hours) = Battery Capacity (Ah) / Current (A) Run Time = 55 Ah / 29.76 A ≈ 1.848 hours. Rounding this value gives approximately 1.8 hours, which corresponds to option A. The other options are incorrect as they do not result from these calculations.