On a lake carol rowed a boat for 1/8 mile then Luke rowed the boat for 3/8 mile how far did carol and Luke row in all

Carol rowed 1/8 mile and Luke rowed 3/8 mile, so together they rowed 1/8 + 3/8 = 4/8 = 1/2 mile.

Therefore, Carol and Luke rowed a total of 1/2 mile in all.