diff --git a/codewars/7kyu/radio-dj-helper-function/koronya.js b/codewars/7kyu/radio-dj-helper-function/koronya.js
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+++ b/codewars/7kyu/radio-dj-helper-function/koronya.js
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+// [JS][7kyu] Radio DJ helper function
+// radio-dj-helper-function
+// https://www.codewars.com/kata/561bbcb0fbbfb0f5010000ee/train/javascript
+
+const convertPlayback = (playback) => {
+  const [minutes, seconds] = playback.split(':').map(Number)
+  return minutes * 60 + seconds
+}
+
+const longestPossible = (playback) => {
+  const arr = songs.filter((song) => convertPlayback(song.playback) <= playback).sort((a, b) => convertPlayback(b.playback) - convertPlayback(a.playback))
+  return arr.length > 0 ? arr[0].title : false
+}