Pwave arrival = 8: 06 s wave arrival= 8: 07 difference between p and s wave arrival times (mins)= 1: 00 what is the distance to epicenter(km)?

8.4 kilometers is the distance to the Epicenter.  

Explanation:

According the definition and the formula that is provided states Epicenter is the difference in the arrival time between the shear wave and the compressional wave.

And after calculating the difference multiply the difference value with 8.4 to estimate the distance, in kilometers.

So in the given question the difference is one minute when multiplied with 8.4 gives 8.4 kilometers. Scientists have used this method loads of time to locate the epicenter of the earthquake.