Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross-sectional area $A=10c{m}^2$and length  $=20cm.$ If one of the solenoid has 300 turns and the other 400 turns, their mutual inductance (in H) is $\text{X}\times {10}^{-5}\text{H}.$ The value of ‘X’ (rounded off to nearest integer) is