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An automobile travels from city A to city B and returns to city A by the same route. The speed of the vehicle during the onward and return journeys were constant at 60 km/h and 90 km/h, respectively. What is the average speed in km/h for the entire journey?
  • a)
    72
  • b)
    73
  • c)
    74
  • d)
    75
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
An automobile travels from city A to city B and returns to city A by t...
Solution:

Let the distance between A and B be d km.
Time taken to travel from A to B = d/60
Time taken to travel from B to A = d/90
Total time taken for the entire journey = d/60 + d/90 = 5d/180
Average speed = Total distance / Total time taken
Total distance = 2d (as the automobile travels from A to B and then back to A)
Average speed = 2d / (5d/180) = 72 km/h

Therefore, the correct answer is option A) 72.
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Community Answer
An automobile travels from city A to city B and returns to city A by t...
(2×60×90)÷(60+90)=72
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An automobile travels from city A to city B and returns to city A by the same route. The speed of the vehicle during the onward and return journeys were constant at 60 km/h and 90 km/h, respectively. What is the average speed in km/h for the entire journey?a)72b)73c)74d)75Correct answer is option 'A'. Can you explain this answer?
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