How to find the bulk modulus of elasticity of steel | Sound Waves

One end of a steel pipe of length 660 m is struck a blow. A listener at the other end hears two sounds at an interval of 1.89 seconds, one from the wave that has travelled along the metal portion of the pipe and the other from the wave that has travelled through air. If the density of steel is 8 × 103 kg/m3 and the velocity of sound in air is 330 m/s, find the bulk modulus of elasticity of steel.