How to submit a value to Qualifield

I have a test to submit in the plataform Qualifield, and the code is running correctly, but i cant send it, the return probably is not the right way to send the result. someone knows how to submit it?

 function retornaTempoArenaEmMilisegundos(distancia,velocidade) {      const convert_KM = (distancia / 3.6)      const tempo = (convert_KM / velocidade)      console.log(tempo)      return(tempo)    }