Measuring Amplitude...?

I need some help figuring out the amplitude of each based on the following:

Station A: 622km away & 64 sec
Station B: 417km away & 43 sec
Station C: 582km away & 59 sec

Any help would be greatly appreciated.

-Thanks

...trying to determine the magnitude of an earthquake via the distance and amplitude, but this was the only information that was provided.
 
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