Hi Guys really stuck on this one and need a bit of guidance as how to proceed!

(See attachment)

Q1 a, Determine I1,I2and I3 after 5 time constants

b, when the switch is first closed ie t=0

c,when the switch re opens

im not sure how to calculate the currents in the loop with an inductor in the circuit ?

i=I[1-e --RL/L]

i havnt practiced any circuits with resitance in series and parallel just looking for a way forward on how to write the equations down for each one

with the circuit initially closed i imagine its basic kirchoffs laws to calculate I1,2 and 3 but these will be very small as almost all of the supply voltage is going to the inductor but after 5 time constants at 63.2% steady state the current values will increase

any help appreciated

regards Ian