How would I create a CONVERSION FACTOR for this? Trying to convert mph TO miles per minute mentally is hurting my brain... Triathlete Dan runs along a 2-mile stretch of river and then swims back along the same route. If Dan runs at a rate of 10 miles per hour and swims at a rate of 6 miles per hour,...

I understand why #1 is sufficient based off the explanation provided on the CAT, but I don't understand why #2 is INSUFFICENT. Below (in bold) is the reasoning provided as to WHY #2 is insufficient. I can't see how the hundreds digit times 2 equals the tens digit. Uh, 4x2=2? 8x2=4? This doesn't make...