Two Loop RL Circuit 2 "Smartphysics" solution.

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https://www.lyft.com/drivers/WALID887565?utm_medium=d2di_iaem A circuit is constructed with four resistors, one inductor, one battery and a switch as shown. The values for the resistors are: R1 = R2 = 24 Ω, R3 = 111 Ω and R4 = 128 Ω. The inductance is L = 246 mH and the battery voltage is V = 12 V. The positive terminal of the battery is indicated with a + sign.
1) The switch has been open for a long time when at time t = 0, the switch is closed. What is I4(0), the magnitude of the current through the resistor R4 just after the switch is closed?
A
2) What is I4(∞), the magnitude of the current through the resistor R4 after the switch has been closed for a very long time?
A
3) What is IL(∞), the magnitude of the current through the inductor after the switch has been closed for a very long time?
A
4) After the switch has been closed for a very long time, it is then opened. What is I3(topen), the current through the resistor R3 at a time topen = 4 ms after the switch was opened? The positive direction for the current is indicated in the figure.
A
5) What is VL,max(closed), the magnitude of the maximum voltage across the inductor during the time when the switch is closed?
V
6) What is VL,max(open), the magnitude of the maximum voltage across the inductor during the time when the switch is open?
V