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Time constant for a circuit

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3. What is the time constant for a circuit of 10 Volts, followed by a capacitor of 60 micro farads, a switch, then a 4k ohm resistor?

4. What is the time constant for a circuit of 5 Volts, followed by a switch, then a 3 ohm resistor, then a 4 mH inductor, then a 2 ohm resistor in parallel with the 3 ohm resistor?

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3. What is the time constant for a circuit of 10 Volts, followed by a capacitor of 60 micro farads, a switch, then a 4k ohm resistor?

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