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The earth has a radius of 6400 km . The ...

The earth has a radius of 6400 km . The inner core of 1000km radius is solid. Outside it, there is a region from 1000 km to a radius of 3500 km which is in molten state. Then again from 3500 km to 6400 km the earth is solid.Only longitudinal (P) waves can travel inside a liquid. Assume that the P wave has a speed of `8km s^(-1)` in solid parts and of `5 km s^(-1)` in liquid parts of the earth. An earthquake occur at some place closer to the surface of the earth.CAlculate the time after which it will be recorded in a seismometer at a diametrically opposite point on the earth if wave travels along diameter?

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