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 60 miles per hour, what is v in miles per hour?
Choose the correct choice from the following answers:
A) 30	B) 40	C) 50	D) 55	E) 70
Let distance be D.   We can find the total time &amp; equate it, which comes as:   0.8D / 80 + 0.2D / v = D / 60   =&gt; v = 30   30NSWER:30
<result>A</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 60 miles per hour, what is v in miles per hour?