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Tina goes to school from her house at a speed of 3 km/hr and returns at a speed of 2 km/hr. If she takes 5 hours in total, then what is the distance between her house and school?
  • a)
    6 km
  • b)
    7 km
  • c)
    5 km
  • d)
    6.5 km
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Tina goes to school from her house at a speed of 3 km/hr and returns a...
Solution:

Given:
Tina's speed from house to school = 3 km/hr
Tina's speed from school to house = 2 km/hr
Total time taken = 5 hours

Let the distance between Tina's house and school be x km.

Calculating time:
Time taken to go from house to school = x/3 hours
Time taken to come back from school to house = x/2 hours
Total time taken = x/3 + x/2 = 5 hours

Solving the equation:
Multiplying through by 6 to clear the denominators:
2x + 3x = 30
5x = 30
x = 6 km
Therefore, the distance between Tina's house and school is 6 km.
Therefore, the correct answer is option A) 6 km.
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Community Answer
Tina goes to school from her house at a speed of 3 km/hr and returns a...
Let the distance between Tina's house and school be 'x' km.
Therefore, time to cover the distance from her house to school = (Distance/ speed) = (x/3) hours.
Similarly, time to cover the distance from her school to house = (x/2) hours.
It is given that total time taken for whole journey= 5 hours.
Thus, (x/3 + x/2)= 5
⇒ ((2x+3x)/6)= 5
⇒ (5x/6) = 5
⇒ 5x=30 or x=6
Thus, distance between her house and school is 6 km
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