Four Waves Are Described by the Following Expressions, Where Distances

Four waves are described by the following expressions, where distances are measured in meters and times in seconds. I y = 0.12 cos(3x - 21t)
II y = 0.15 sin(6x + 42t)
III y = 0.13 cos(6x + 21t)
IV y = -0.23 sin(3x - 42t)
Which of these waves have the same speed?

A) I and II
B) I and III
C) II and III
D) III and IV
E) II and IV

Correct Answer:

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