John traveled 80% of the way from Yellow-town to Green-fields by train at an average speed of 80 miles per hour. The rest of the way John traveled by car at an average speed of v miles per hour. If the average speed for the entire trip was 70 miles per hour, what is v in miles per hour?  Choose the correct option:
A) 30
B) 40
C) 50
D) 55
E) 60
HiBunuel   THe question seems incorrect. it should not be 80% at the speed of 80. However if it's 20% at the speed of 80, Answer comes out 55.   The question is correct. Here's the explanation:   Let distance be D. We can find the total timeequate it, which comes as:   0.8D / 80 + 0.2D / v = D / 70 =&gt; v = 60 (Option 60).
<result>E</result>
John traveled 80% of the way from Yellow-town to Green-fields by train at an average speed of 80 miles per hour. The rest of the way John traveled by car at an average speed of v miles per hour. If the average speed for the entire trip was 70 miles per hour, what is v in miles per hour?