The distance between two successive minima of a transverse wave is $2.7 \ m$. Five crests of the wave pass a given point along the direction of travel every $15.0 \ s$. The speed of the wave is (in $m \ s^{-1}$)
- A$0.9$
- B$1.2$
- C$0.5$
- D$2.4$
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