- #1

ducmod

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## Homework Statement

Hello!

Here is the word problem that should be solved based on hyperbola equation (exercise from

hyporbola topic):

The P-waves (\P" stands for Primary) of an earthquake

in Sasquatchia travel at 6 kilometers per second.10 Station A records the waves rst. Then

Station B, which is 100 kilometers due north of Station A, records the waves 2 seconds later.

Station C, which is 150 kilometers due west of Station A records the waves 3 seconds after

that (a total of 5 seconds after Station A). Where is the epicenter?

My question is about the first part, i.e. station A and B (for now):

Given the distance between station A and station B of 100 km,

and the speed of waves of 6 km/second, and the fact that

station A has recorded the wave 2 seconds earlier than station B,

how can the distance between them be 100 km?

Please, help me to understand this and correct me:

wave speed is 6 km/sec, hence in 2 seconds it covered 12 kilometers.

Shouldn't it mean that the distance between A and B is 12 km, which is

the same as to say that the epicenter is 12 kilometers closer to A than

to B?Thank you!