A man drives 150 miles to the seashore in 3 hours and 20 minutes. He returns from the shore to the starting point in 4 hours and 10 minutes. Let r be the average rate for the entire trip. Then the average rate for the trip going exceeds r in miles per hour, by:
<spanclass=′latex−bold′>(A)</span>5<spanclass=′latex−bold′>(B)</span>421<spanclass=′latex−bold′>(C)</span>4<spanclass=′latex−bold′>(D)</span>2<spanclass=′latex−bold′>(E)</span>1