Answer
$v_1 = v_2 = v_3$
Work Step by Step
We can write the expression for the speed of a wave as:
$v = \sqrt{\frac{F}{\mu}}$
Since the waves are moving along the same string, the speed of each wave is the same. The speed of the wave does not depend on the amplitude. Therefore;
$v_1 = v_2 = v_3$
