The speed of P waves is approximately 7 km/s, and that of S waves is about 4 km/s
x = ct
=> x = cp*tp = cs*ts
tp = cs/cp * ts
So,
tp - ts = ts(cs/cp - 1)
|tp - ts} = 30 s
= ts((4/7) -1)
= ts(0.43)
30 = ts(0.43)
=> ts = 69.76 s
So,
x = 4 km/s * 69.76
= 280 km (Ans)
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