Two harmonic waves are described by

$y_1=(3m)sin(\frac{4}{m}x-\frac{700}{s}t)$

$y_2=(3m)sin(\frac{4}{m}x-\frac{700}{s}t-2)$

What is the amplitude of the resultant wave?

$3\mathrm{.}2$ m

$8\mathrm{.}0$ m

$4\mathrm{.}3$ m

$6\mathrm{.}0$ m

$3\mathrm{.}0$ m