A wave travelling in positive X-direction with a $=$ 0.2 ms$-$2, velocity = 360 ms$-$1 and $\lambda $ $=$ 60 m, then correct expression for the wave is
$y = 0.2\sin \left[ {2\pi \left( {6t + {x \over {60}}} \right)} \right]$
$y = 0.2\sin \left[ {\pi \left( {6t + {x \over {60}}} \right)} \right]$
$y = 0.2\sin \left[ {2\pi \left( {6t - {x \over {60}}} \right)} \right]$
$y = 0.2\sin \left[ {\pi \left( {6t - {x \over {60}}} \right)} \right]$
