An earthquake generates both transverse (S) and longitudinal (P) sound waves in the earth. The speed of S waves is about 4.5 km/s and that of P waves is about 8.0 km/s. A seismograph records P and S waves from an earthquake. The first P wave arrives 4.0 min before the first S wave. The epicenter of the earthquake is located at a distance about
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C
Suppose d = distance of epicenter of Earth quake from point of observation
v S = Speed of S-wave and v P = Speed of P-wave then 
or 
∴ ∴ 
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