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anonymous

  • 4 years ago

A train of length 180m approaches a tunnel of length 620m. How long will it take the train to pass completely through the tunnel at a speed of 54 km/h??

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  1. anonymous
    • 4 years ago
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    Hiya, what are your own thoughts, so far?

  2. anonymous
    • 4 years ago
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    180+620/54

  3. anonymous
    • 4 years ago
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    Sounds good to me!

  4. anonymous
    • 4 years ago
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    really???

  5. anonymous
    • 4 years ago
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    The only issue would be your units. You're dividing metres by kilometers per hour, which doesn't sound like a good idea.

  6. anonymous
    • 4 years ago
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    Are you doing this as part of maths, or physics?

  7. anonymous
    • 4 years ago
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    maths

  8. anonymous
    • 4 years ago
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    Great, you need to make sure with these kinds of questions is that your units are consistent. That means it's probably best to work with metres and seconds, so try converting the 54 kilometers per hour into metres per second.

  9. anonymous
    • 4 years ago
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    how do you convert from 54 km/h to km/s

  10. anonymous
    • 4 years ago
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    Not km/s, but m/s.

  11. anonymous
    • 4 years ago
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    54km per hour means 54,000 metres per hour. How many seconds are there in an hour?

  12. anonymous
    • 4 years ago
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    3600??

  13. anonymous
    • 4 years ago
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    That's right.

  14. anonymous
    • 4 years ago
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    So 54 km per hour is the same as 54,000 metres every 3,600 seconds.

  15. anonymous
    • 4 years ago
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    Given that, can you work out how many metres every ONE second?

  16. anonymous
    • 4 years ago
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    15??

  17. anonymous
    • 4 years ago
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    That's right. So the train is travelling at 15 metres every second, that's 15 m/s. Now can you answer your original question?

  18. anonymous
    • 4 years ago
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    Remember, as you rightly worked out before, the distance is 180+620=800m. Now that you know the speed as well as the distance, can you work out the time?

  19. anonymous
    • 4 years ago
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    so that would be 800/15= 53.3

  20. anonymous
    • 4 years ago
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    Sounds good!

  21. anonymous
    • 4 years ago
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    HORAAAYYY

  22. anonymous
    • 4 years ago
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    Congratulations!

  23. anonymous
    • 4 years ago
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    Thank you so much, you will become a legend in no time

  24. anonymous
    • 4 years ago
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    Thanks, glad to help!

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