A student traveled 30 percent of the distance of the trip alone, continued another 40 miles with a friend, and then finished the last half of the trip alone. How many miles long was the trip?  Select the correct option:  A) 120  B) 140  C) 160  D) 180  E) 200
Let x be the total length of the trip.   0.3x + 40 miles + 0.5x = x   40 miles = 0.2x   x = 200 miles   The answer is 200.
<result>E</result>
A student traveled 30 percent of the distance of the trip alone, continued another 40 miles with a friend, and then finished the last half of the trip alone. How many miles long was the trip?