AP and TS EAMCET Engineering 2020 Model Paper 2

A train is moving at 30 m/s in still air.The frequency of the locomotive whistle is 500HZ and the speed of sound is 345 m/s.what would be the apparent wavelength s in front of and behind the locomotive if a wind of speed 10 m/s were blowing in the same direction as that in which the locomotive is travalling?