An earhquake generates both transverse (S) and logitudinal (P) sound wave in the earth .The speed of (S) wave is about `4.5km//s` and that of (P) wave is about `8.0km//s` A seismograph records P and S wave from an earthquake. The first P wave arrives `4.0 min` before the first S wave. The epicenter of the earthquake is located at a distance of about
A. `25 km`
B. `250 km`
C. `2500 km`
D. `5000 km`