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## Homework Statement

When an earthquake occurs, two types of sound waves are generated and travel through the earth. The primary, or P, wave has a speed of about 8.13 km/s and the secondary, or S, wave has a speed of about 5.32 km/s. A seismograph, located some distance away, records the arrival of the P wave and then, 78.8 s later, records the arrival of the S wave. Assuming that the waves travel in a straight line, how far is the seismograph from the earthquake?

## Homework Equations

V=(wavelength)/T or f(wavelength)

## The Attempt at a Solution

I solved for each wavelength for P and S

P = 641km, S= 419km

I then used the forumla L = (wavelength)/2 .... for each value...

Not sure where to go from here.. pleasse help only two i had trouble with...