A sound wave travels twice as far in neon (Ne) as it does in

A sound wave travels twice as far in neon (Ne) as it does in krypton (Kr) in the same time interval. Both Neon and Krypton can be treated as monatomic ideal gases. The atomic mass of Neon is 20.2u, and that of krypton is 83.8u. The temperature of the krypton is 293K. What is the temperature of the neon?