A & B crosses (2 mins). A return to the starting point of the bridge and passes the flashlight to Person C and “sloth human”. (1 min) Person C and “sloth human” proceed to cross the bridge, leaving Person A. (10 min) Person C passes the flashlight to Person B. Person B return to the starting point of the bridge to…

A & B cross first (2mins) , leaving C & D (sloth human). A return to meet C & D. (1 min) A passes the flashlight to C and C brings the sloth human to meet B.(10 mins) A is left on the other side of the bridge. When C and the sloth human met B, C passes the flashlight to B. Immediately, B holds on the flashlight to…