earth science homework help?

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leeeaaa

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Station A is 7,200 km away from an epicenter. Station B first detects the P-wave at 3 min. 40 sec. Station C receives the P-wave one minute earlier than station A. Which station detected the P-wave first? If that station detected the P-waves arrive to be at 2:30p.m., What is the origin time of the earthquake?

how do i find the answer to the second question?
 
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