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khuct : I've played around with this problem, and I feel like there is some assumption or bit of knowledge that I'm not privy to. Here's my thinking, tell me if I'm missing something - apparently the physics of bikes is beyond me.
1. The rate of forward speed should equal the rotational speed of the front tire, multiplied by it's circumference. Also, it seems to me that if sprocket on the front tire rotates as fast as the rim of the tire, so if the sprocket goes at 1.5 rev/sec, then so does the 28 in outer diameter, and thus it seems to me like the problem is overspecified, and that 1.5 rev/sec times 28*pi*conversion factor better equal 11 miles per hr. There must be a piece of information that eludes me.
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