Two cars are moving towards each other at the speed of \(50\,\text{m s}^{-1}\). If one of the cars blows a horn at a frequency of \(250\,\text{Hz}\), the wavelength of the sound perceived by the driver of the other car is
\[
\text{(Speed of sound in air }=350\,\text{m s}^{-1}\text{)}
\]