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[" nelocities of sound waves in four med...

[" nelocities of sound waves in four media "P,Q" R and "S" are "18,000km/h,900km/h,0km/h" ,an "],[" velocities of sound which medium could be a liquid substance? "],[[" Whe rese "," (b) "Q," (c) "R," (c) "R]]

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