Great question. I’m going to step you through it with a few questions. We’ll go back and forth a bit until it’s clear to you!
1. The fact that you have L1 and L2 as the power supply tells you what the source voltage is. Do you know what it is?
2. You are describing two loads (elements) in series. Will the current change at different points in the circuit, or is it always the same?
Answer those and we’ll keep going!