Add two video lengths

JavaScript Advanced astronaut ages teen+ From CS Unplugged

The problem

Video lengths are written "hours:minutes:seconds", like "0:32:21". Write a function addDurations(a, b) that adds two lengths and gives back the total in the same form, with no extra zeros. Example: "0:32:21" + "0:33:20" is "1:5:41".

You will practice: splitting text, remainder (%), whole-number division, units of time

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CC BY-SA 4.0

Adapted from a CS Unplugged programming challenge by the University of Canterbury Computer Science Education Research Group, licensed CC BY-SA 4.0.

Original challenge · License: CC BY-SA 4.0

Changes: Rewritten in our own words as a function with tests, hints and steps, in Python and JavaScript, by Open Cosmos. This version is also CC BY-SA 4.0.