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We know that  20 compressions and 20 rarefactions make   20 oscillation
of the wave so the time period is 0.2/20=0.01 s
so  frequency is  f=1/T
1/0.01=100 Hz 
distance between rarefaction and compression is 50 cm so  distance between two rarefactions and two compressions is 2*50=100 cm=1 m
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