import java.util.Scanner;

public class LabProgram {

public static double milesToLaps(double userMiles){

double mileslaps=0.25;

double total;

total= userMiles/mileslaps;

System.out.printf("%.2f",total);

}

public static void main(String[] args) {

Scanner scnr= new Scanner(System.in);

double miles;

miles= scnr.nextDouble();

milesToLaps(miles);

}

}

I wrote this code and works in my Jgrasp but in zybooks I have an error that said

zyLabsUnitTest.java:10: error: incompatible types: void cannot be converted to double

studentResult = studentMain.milesToLaps(1.5);

Why is this happening?