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## Homework Statement

Earthquakes produce several types of shock waves. The most well-known are the P-waves and the S-waves. In the earth’s crust, the P-waves travel around 7.0 km/s while the S-waves move at about 3.6 km/s. The time delay between the arrival of these two waves at a seismic recording station tells geologists how far away the earthquake occurred. If the time delay is 19 s, how far away from the seismic station did the earthquake occur?

Answer in book is 140.8 m but I can't make it to that answer. Any help would be great.

Thanks.

## Homework Equations

## The Attempt at a Solution

Tried to find the x distance by using: X-Xo = ((Vox + Vx)*.5)*t