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If Rashi runs from her gym to dance school at a speed of 35 km/h and comes back from dance school to gym at a speed of 15 km/h, find the average speed during the journey.
  • a)
    50
  • b)
    21
  • c)
    25
  • d)
    28
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
If Rashi runs from her gym to dance school at a speed of 35 km/h and c...
Let the total distance between her gym and dance school be d, then
Total distance covered by Rashi is 2d
Time taken = Distance/Speed
⇒ Total time taken = (d/35) + (d/15)
⇒ Total time taken = 10d/105
Average Speed = Total Distance/Total Time
⇒ 2d/(10d/105)
⇒ 21 km/h
∴ Average Speed = 21 km/h
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If Rashi runs from her gym to dance school at a speed of 35 km/h and comes back from dance school to gym at a speed of 15 km/h, find the average speed during the journey.a)50b)21c)25d)28Correct answer is option 'B'. Can you explain this answer?
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