A train that is one mile long starts through a tunnel that is also one mile long. The train is traveling fifteen miles per hour. How long does it take for the train to get completely out of the tunnel?
Russell finds out the winner of the school talent show at 4:00 pm on Friday. He calls two 7th grade friends at 4:15pm to tell them. By 4:30 pm, they each call two 7th grade friends. If each person who is called calls two more 7th graders every fifteen minutes, when will all 176 seventh grade students know the winner?
Mary bought some doughnuts. She gave ½ her doughnuts plus ½ of a doughnut to her Mom. Then she gave away ½ her remaining doughnuts and ½ a doughnut to her aunt. Then she gave ½ of her remaining doughnuts and ½ a doughnut to her sister Kathy. This left her with ¼ of a dozen doughnuts. How many doughnuts had she purchased?