fnes_5_skate_1.js

const team1 = {
  name: 'italy',
  skaters: [
    { name: 'i1', time: 3000, und: 40 },
    { name: 'i2', time: 2000, und: 30 },
    { name: 'i3', time: 1000, und: 20 }
  ]
};

const team2 = {
  name: 'korea',
  skaters: [
    { name: 'k1', time: 4000, und: 30 },
    { name: 'k2', time: 800, und: 20 },
    { name: 'k3', time: 1200, und: 20 }
  ]
};

function upAndDown(skater) {
  return Math.floor((Math.random() * skater.und));
}

function skate(skater) {
  console.log(`${skater.name} 출발`);
  return new Promise(function(resolve) {
    setTimeout(function() {
      resolve();
    }, skater.time + upAndDown(skater));
  });
}