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Hiya, what are your own thoughts, so far?
Sounds good to me!
The only issue would be your units. You're dividing metres by kilometers per hour, which doesn't sound like a good idea.
Are you doing this as part of maths, or physics?
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.
how do you convert from 54 km/h to km/s
Not km/s, but m/s.
54km per hour means 54,000 metres per hour. How many seconds are there in an hour?
So 54 km per hour is the same as 54,000 metres every 3,600 seconds.
Given that, can you work out how many metres every ONE second?
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?
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?
so that would be 800/15= 53.3
Thank you so much, you will become a legend in no time
Thanks, glad to help!