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If a train travels at 60 km/hr from Bangalore to Hyderabad and at 80 km/hr on return trip from Hyderabad to Bangalore. What is its average speed for the entire trip?
  • a)
    70 km/hr
  • b)
    65.5 km/hr
  • c)
    68.5 km/hr
  • d)
    75 km/hr
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
If a train travels at 60 km/hr from Bangalore to Hyderabad and at 80 k...
Given:
Speed from Bangalore to Hyderabad = 60 km/hr
Speed from Hyderabad to Bangalore = 80 km/hr

To find:
Average speed for the entire trip

Solution:
Let the distance between Bangalore and Hyderabad be "d" km

Time taken to travel from Bangalore to Hyderabad = d/60
Time taken to travel from Hyderabad to Bangalore = d/80

Total distance covered = 2d
Total time taken = d/60 + d/80 = (4d+3d)/240 = 7d/240

Average speed = Total distance covered/Total time taken
= 2d/(7d/240)
= 480/7
= 68.57 km/hr (approx)

Therefore, the average speed for the entire trip is 68.57 km/hr (approx). Hence, the correct option is (c) 68.5 km/hr.
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Community Answer
If a train travels at 60 km/hr from Bangalore to Hyderabad and at 80 k...
Standard Formula: If a certain distance is covered at x km/hr and the same distance is covered at y km/hr, then
2xy
Average Speed = km/hr
By looking at the above problem, we can say that, x= 60 km/hr and y= 80km/hr.
Therefore, average speed = [(2 * 60 * 80)/(60+80)] km/hr = 9600/140 = 68. 57 km/hr
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If a train travels at 60 km/hr from Bangalore to Hyderabad and at 80 km/hr on return trip from Hyderabad to Bangalore. What is its average speed for the entire trip?a)70 km/hrb)65.5 km/hrc)68.5 km/hrd)75 km/hrCorrect answer is option 'C'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about If a train travels at 60 km/hr from Bangalore to Hyderabad and at 80 km/hr on return trip from Hyderabad to Bangalore. What is its average speed for the entire trip?a)70 km/hrb)65.5 km/hrc)68.5 km/hrd)75 km/hrCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If a train travels at 60 km/hr from Bangalore to Hyderabad and at 80 km/hr on return trip from Hyderabad to Bangalore. What is its average speed for the entire trip?a)70 km/hrb)65.5 km/hrc)68.5 km/hrd)75 km/hrCorrect answer is option 'C'. Can you explain this answer?.
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