Question: a trained covered x km at 40 kmph and another 4 x km at 20 kmph . find the average speed of the train in covering the entire 3 x km .
A) 11.33 kmph
B) 12.33 kmph
C) 13.33 kmph
D) 14.33 kmph
E) 23.33 kmph
Correct answer: C
Grade: 8 | Topic: Expressions and Equations | Difficulty: Medium | Standard: 8.EE.B.5