Hi, could I get some help with this micro-macro connection physics problem involving root mean square speed?

The set up is:

For an atom in an ideal gas with rms speed in one direction, v_x = 100 m/s, and mass m = 6.66e-27 kg, what is the temperature T in kelvin (K) to four digits of precision if Boltzman constant k_B = 1.38e-23 J/K?

Thank you.