Calculating Velocities, dip and depth of a refractor

[loya Blaise]

https://scontent-vie1-1.xx.fbcdn.net/v/t34.0-12/14955857_1113106435476531_5016282393940245289_n.jpg?oh=c2e50935ccd57a0863d5f00c5b56653a&oe=5821DD35

Shot point A and B are located at a 225m spread of 16 geophones. Using the data in the attachment, Find
1. The Velocities, V1and V2
2. The Dip()
3. The depth of the refractor, h

My understanding of the Problem
v=(x2-x1)/(t2-t1),,where V is d velocity and x1, x2 are distances of any two recording stations from the shot point(source),, t1 and t2 are the times of arrival of the seismic wave at d same stations.

i have tried ploting tA against Xa, and tB against Xb all on the same graph. but don't just know what to do nest.please help me out

 

[Bystander]

@CapnGranite

 

[CapnGranite]

Is there some reason the attachment won't open? It would help to know what other data you were given. Until I can think up a simple plan to attack the problem, try this source. My other problem is that I've always had an assistant do my LaTex presentations and I'd still be typing my reply next Tuesday. I would like to see what else is on the attachment.

http://appliedgeophysics.berkeley.edu/seismic/seismic_23.pdf
7.2.3 Time – Distance Plots
Refraction calculations start on page 15.