Question

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Answer 1

✔✔Here is your answer in the attachment ✔✔

Answer 2

✔✔Here is your answer ✔✔

Let x Km be distance ; tp and ts seconds the time taken by P and S waves, then

ts = x/4.0 s , tp= x/8.0 s

Given ts - tp=4 min = 4×60s

=> x/4.0 - x/8.0=240

or. 2x-x/8 = 240

or. x=240×8km=1920km