Jacob is roller skating. He can skate 3/10 of a mile in 1/2 of a minute. What is Jacob's unit rate in miles per minute?

To find the unit rate, we must divide the distance in miles by the time in minutes: {{{(3/10)/(1/2)=(3/10)*(2/1)=6/10=3/5}}} So Jacob skates at a rate of 3/5 mile per minute. Answer: \boxed{\frac{3}{5}}.