VibramWomen's FiveFingers V- Run Shoe

Can I wear these for long distance running?

I know this is a crazy question, but could I wear these hiking also?

I wear a 7.5 and wide foot. My last pair fit perfectly but they no longer make them. What size ahould i get in these?

I just purchased 7.5 to 8 size and it's too small. I need a size 40 can you tell what US size to purchase?