Function tandemBicycle

arrays/tandem-bicycle.js:21–29

(redShirtSpeeds, blueShirtSpeeds, fastest)

// 9 + 6 + 5 + 3 + 2 = 25

function tandemBicycle(redShirtSpeeds, blueShirtSpeeds, fastest) {
  redShirtSpeeds.sort((a, b) => b - a);
  if (fastest) {
    blueShirtSpeeds.sort((a, b) => a - b);
    return sumSpeeds(blueShirtSpeeds, redShirtSpeeds);
  }
  blueShirtSpeeds.sort((a, b) => b - a);
  return sumSpeeds(blueShirtSpeeds, redShirtSpeeds);
}

function sumSpeeds(red, blue) {
  let sum = 0;