If - like here - you are asked for a "difference", that usually means you have to subtract.
The difference is 2950-2550 = 400 meters
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It is: (2550+2600)/2 = 2575.
7% of 2,550 = 7% * 2550 = 0.07 * 2550 = 178.5
If, 100 is included by "between", the answer is 2550. If not, it is 2450.
850, ie 2550/3
17000 x 9/60 = 2550 meters or 2.55 km