A trained covered x km at 40 kmph and another 2x km at 20 kmph. Find the average speed of the train in covering the entire 2x km.	Choose the correct answer:  A) 16  B) 18  C) 24  D) 19  E) 12
Total time taken = x/40 + 2x/20 hours   = 5x/40 = x/8 hours   16verage speed = 2x/(x/8) = 16 kmph   16nswer: 16
<result>A</result>
A trained covered x km at 40 kmph and another 2x km at 20 kmph. Find the average speed of the train in covering the entire 2x km.