Question 1137410
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The problem is very poorly stated; without making assumptions, it can't be answered.<br>
So I will assume the 20 miles by Bob and the 15  miles by Tom are in the same amount of time.<br>
In that case, since the times are the same and the ratio of distances is 4:3, the ratio of speeds is also 4:3; so call the speeds 4x and 3x.  Then, if Bob's speed is 25mph faster than Tom's,<br>
{{{4x-3x = 25}}}
{{{x = 25}}}<br>
Bob's speed is 4x = 100mph; Tom's speed is 3x = 75mph.