Help with hard physics problem?

Question

I have tried it but no luck, please help me. Thanks!

A block of mass 3.1 kg rests on a frictionless inclined plane, held in place by a string of mass 0.023 kg. The angle of the plane from the horizontal is 32°, and the string length is 1.5 m. How long does it take a wave to travel from one end of the string to the other? Note: Since the string is so much less massive than the block, the mass of the string can be neglected when calculating its tension.

Answer 1

The The velocity of a traveling wave (v) in a stretched string is determined by the tension (T) and the mass (Ms) per unit length (L) of the string.

v=sqrt(T/(Ms/L))
v=sqrt(T L/Ms)

T=Wsin(32)
T=m g sin(32)

Finally

v=sqrt(m g sin(32) L/Ms)
v=sqrt(3.1 x 9.81 x sin(32) x 1.5 /.023)
v= 32.4 m/s