A captive queen and her son and daughter were locked in the top room of a very high tower. Outside their window was a pulley with a rope around it, and a basket fastened to each end of the rope. Both baskets weighed the same. One basket is at the top of the tower, the other basket is on the ground. They managed to escape the tower using the pulley and baskets and a weight that they found in the room. It's too dangerous for any of them to come down if they weigh more than 15lbs more than the contents of the other basket, because they would do so too quickly. The one basket coming down would naturally of course draw the other up. The queen weighed 195 lbs. daughter 105, son 90, and the weight 75 lbs. How did they all escape safely?