Read the following passage and solve the questions based on it.
Given below is the structure of roads from A to F. ABC and CDF are two similar mountains with ideal straight lines AB and CD as their slant heights. ∠ BAC = ∠ DCF = 30° and ∠ BCA = ∠ DFC = 60°. Speed of Manoj Kumar uphill is 20 miles/h and downhill is 40 miles/h.
What is the total time taken by him to travel from A to F ?