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The distance between stations A and B is 778 kilometres. A train travels from station A to station B at a uniform speed of 84 km/h and then returns to station A at a uniform speed of 56 km/h. What is the train's average speed (in km/h) throughout the journey?
  • a)
    63.4
  • b)
    66
  • c)
    67.2
  • d)
    65
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The distance between stations A and B is 778 kilometres. A train trave...
Given:
Distance between stations A and B = 778 km
Speed while going from A to B = 84 km/h
Speed while returning from B to A = 56 km/h
Concept Used:
Time =
Calculation:
⇒ Time taken for going from station A to B = hours
⇒ Time taken for returning from B to A = hours
⇒ Total Distance of travel = 778 + 778 = 1556 km
⇒ Average Speed throughout the journey = km/h
Hence, the average speed of the train throughout the journey is 67.2 km/h
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The distance between stations A and B is 778 kilometres. A train travels from station A to station B at a uniform speed of 84 km/h and then returns to station A at a uniform speed of 56 km/h. What is the train's average speed (in km/h) throughout the journey?a)63.4b)66c)67.2d)65Correct answer is option 'C'. Can you explain this answer?
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