What is the distance between D and I?
AAA-5-5-5BBB-4-4-4CCC-3-3-3DDD-2-2-2EEE-1-1-1FFF000GGG111HHH222III333JJJ444
Let's begin by marking the letter D on the number line and then proceeding towards the letter I:
AAA-5-5-5BBB-4-4-4CCC-3-3-3DDD-2-2-2EEE-1-1-1FFF000GGG111HHH222III333JJJ444555KKK
Note that the distance between the two letters is 5 steps
5