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Question
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 3x km.
Options:
A .  30 kmph
B .  25 kmph
C .  24 kmph
D .  28 kmph
E .  None of these.
Answer: Option C


Total time taken = x/40 + 2x/20 hours = 5x/40 = x/8 hours Average speed = 3x/(x/8) = 24 kmph



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