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70 miles times 1/87th = 0.80 miles per hour. As was stated earlier, time is a constant, so the only scaled dimension is the miles, or the length. So yes, it really is just that simple. Now, if you want to run a fast clock and scale the time as well, then you'll end up with rocket-fast locos; usually a fast clock is anywhere from 2 to 6 times as fast as normal. The entire reason for using a fast clock, though, is to make or short runs seem longer, because we don't have a full 50 scale miles of mainline to traverse between towns. So, scaling the time in a mph calculation undermines the whole purpose of the fast clock. Just multiply the target mph times the scale ratio, it's easy.
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