i got 12 minutes. speedy and happy cross, 2 minutes. lazy and smarty cross, 10 more minutes. 2 plus 10 equals 12.
you are probably thinking, "but there is only one flashlight, and they have to walk it back to eachother." well, the problem said there is one flashlight, not ONLY one flashlight. well, if there is 2 flashlights, that means there is also one flashlight. i am assuming there is 2 flashlights since it didnt specify that there is not 2 flashlights.