A wave whose speed in a snakey is 4.4 m/s enters a second snakey. The wavelength changes from 2.0 m to 3.0 m. The wave in the second snakey travels at approximately ____.

• A1.5 m/s.
• B2.2 m/s.
• C2.9 m/s.
• D6.6 m/s.

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