Change the calculation of reading time

Hello! Sorry for my bad english.

The helper counts the words in the post and calculates an average reading time of 275 words per minute.

I write a blog in Russian. 275 words per minute too many. The usual reading speed in Russian in an adult lies in the range of 120-180 words per minute.

How can I correct the formula for calculating read speed?

{{reading_time}} is a JavaScript function that’s exposed through handlebars for themes, but the exact same function is also exposed as part of our JS SDK.
By fetching the content using our api client and calling the helper yourself, you have the opportunity to modify the content before calling the helper.

Full Example:

Relevant docs:

I am not good at web technologies. Please explain what should I do with this code?