There is a high speed rail track the length of this track is 210 miles Train departs London at 11:20 and arrives in Manchester 13:28
Train company claims the average speed of this is 104 miles per hour
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Is the average speed 104 miles per hour?

You're doing something i dont know how to do but search up on google slope calculator maybe that will get you there

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)