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traveling waves problem...it's easy but i can't figure it out!?

String 1 has linear density 2.0g/m and string 2 has linear density 4.0g/m . A student sends pulses in both directions by quickly pulling up on the knot, then releasing it. Consider the pulses are to reach the ends of the strings simultaneously.

What's the Length of string 1 and string 2? ( sum of L_1+L_2=4m)

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