David covered a distance of 50 miles on his first trip. On a later trip he traveled 450 miles while going three times as fast. His new time compared with the old time was:  Select the correct option.
A) twice as much	B) three times as much	C) the same	D) half as much	E) a third as much
Let t be the time of the first trip.   On the later trip, David can travel 150 miles in time t.   The trip of 450 miles takes 3t.   The answer is three times as much.
<result>B</result>
David covered a distance of 50 miles on his first trip. On a later trip he traveled 450 miles while going three times as fast. His new time compared with the old time was: