Calculo

new Float:playerpos[3];
new Float:newpos[3];

if(strcmp(cmd, "/start", true) == 0) {
    GetPlayerPos(playerid,playerpos[0],playerpos[1],playerpos[2]);
    printf("Player :%d | X: %f | Y: %f | Z: %f",playerid,playerpos[0],playerpos[1],playerpos[2]);
    return 1;
}

if(strcmp(cmd, "/end", true) == 0) {
    new Float:result;
    GetPlayerPos(playerid,newpos[0],newpos[1],newpos[2]);
    result = floatsqroot(floatpower(newpos[0]-playerpos[0],2) + floatpower(newpos[1]-playerpos[1],2) + floatpower(newpos[2]-playerpos[2],2));
    printf("você percorreu %0.2fm",result);
}