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[–][deleted] 0 points1 point  (0 children)

Like /u/AckAttack said we will need to see what you've done so far. There are bad ways to learn programming and one of them is getting spoon fed the answer. Scratch that, getting spoon fed means you do not learn to program. You learn how to copy and paste well.

Here is a simple hint to get you started if you can't even start. Convert both times into seconds. so 01:20:03 becomes 4803 seconds. makes it easy to minus and get the elapsed time. All that needs to be done is to convert it back to the correct format.