Physics Help Please Just one question thank you?

A sand scorpion can detect the motion of a nearby beetle (its prey) by the waves the motion sends along the sand surface (Fig. below). The waves are of two types: transverse waves traveling at vt = 52 m/s and longitudinal waves traveling at vl = 159 m/s . If a sudden motion sends out such waves, a scorpion can tell the distance of the beetle from the difference Δt in the arrival times of the waves at its leg nearest the beetle. If Δt = 4.6 ms, what is the beetle's distance (in cm)