A boy A having weight { W }_{ A } and a girl B having weight { W }_{ B } stand motionless at the ends of the toboggan, which has weight { W }_{ t } . If A walks to B and stops, and both walk back together to the original position of A (both positions measured on the toboggan), determine the final position of the toboggan just after the motion stops. Neglect friction. Given: { W }_{ A } = 80 lb , { W }_{ B } = 65 lb , { W }_{ t } = 20 lb , d = 4 ft