Answer:
The speed of the wave is 3 m/s.
Step-by-step explanation:
Given that,
Number of waves = 6
Time = 8.0 s
Successive crests

We need to calculate the frequency
Using formula of frequency

Put the value into the formula


We need to calculate the speed of the wave
Using formula of speed

Put the value into the formula


Hence, The speed of the wave is 3 m/s.