Julie drives to her sister’s house and back. She takes the exact same route both ways. On the trip out she drives an average speed of 80 miles per hour. On the trip back she drives an average speed of 40 miles per hour. What is her approximate average speed for the round trip in miles per hour?	Choose the correct choice from the following options
A) 40 B) 48.3 C) 53.33 D) 61.7 E) 70
Average speed = total distance/total time   Here distance to Julie's sister house and back is same as she takes the same route.   D = 80T1 and D=40T2   Therefore, T1 = D/80 and T2 = D/40   T1+T2 = 3d/80   Therefore, average speed  1+ 2= 
<gadget id="calculator"> 1+ 2</gadget>
<output>3</output>
3d/80   Therefore, average speed= 2d/3d/80   =2d * 80/3d   Answer is 53.3 Since, the options are far away we need not solve till the decimal points   So correct answer is option 53.33
<result>C</result>
Julie drives to her sister’s house and back. She takes the exact same route both ways. On the trip out she drives an average speed of 80 miles per hour. On the trip back she drives an average speed of 40 miles per hour. What is her approximate average speed for the round trip in miles per hour?