Calculate the time it takes to read a given amount of words. The output is formatted like this mm:ss
. A reading speed of 180 words per minute (wpm) is assumed, though this can be changed.
Inspired by: https://github.com/RadLikeWhoa/helpers.js/blob/master/Functions/readingtime.js
To separate the float part, you can use %1, then reuse b and save another 5 bytes: