It took 3.5 hours for a train to travel the distance between two cities at a velocity 120 miles/hry. how many miles lie between the two cities? what does it look like solving with the equation?

You have a resistor and a capacitor of unknown values. first, you charge the capacitor and discharge it through the resistor. by monitoring the capacitor voltage on an oscilloscope, you see that the voltage decays to half its initial value in 3.00 ms . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?