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I guess the easiest and most logical way to solve it is as follows:

They meet at 5pm, so A travels in total 3.5 hours with a speed of 20mph, hence it total he covers 70 miles.
If they were separated by 145 miles at the beginning it means that B had to cover 75 miles in 3 hours, hence his speed was 75/3=25mph.

Ans: B
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