You are given the length of a video in minutes. The format is mm:ss (e.g.: "02:54"). Create a function that takes the video length and return it in seconds.
minutesToSeconds("01:00") ➞ 60
minutesToSeconds("13:56") ➞ 836
minutesToSeconds("10:60") ➞ false
false (see example #3)."121:49" is perfectly valid).