At 1:00 pm, the porpoise is 9 feet above the ocean surface. At 1:02 pm, he is
only 6 feet above sea level. At 1:01 pm, the porpoise is 1 foot under water.
But at 1:04 he is 3 feet above the water. At 1:03 pm, the porpoise is 4 feet under
water. And at 1:05 he is 7 feet under water. Find the height of the porpoise at 1:10 pm.