Two waves are approaching each other with a velocity of $20 m/s$ and frequency $n$. The distance between two consecutive nodes is
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(b) Distance between the consecutive node $ = \frac{\lambda }{2},$
but $\lambda = \frac{v}{n} = \frac{{20}}{n}$ so $\frac{\lambda }{2} = \frac{{10}}{n}$
but $\lambda = \frac{v}{n} = \frac{{20}}{n}$ so $\frac{\lambda }{2} = \frac{{10}}{n}$
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