A riverboat travels at an average of 9 miles per hour in still water. The riverboat travels 90 miles up the miami river and 90 miles down the same river in a total of 19 hours. What was the speed of the current of the river?

Sherrie is baking a pie for her family. she leaves the room and comes back to 35% of the pie having been eaten before she can put the topping on. how much 1 square inch strips of dough will she need for the top, now that a portion is missing? round your answer to the nearest while nimber.