Answer :

First you need to find how many miles/hour it traveled
186/3=62 That means the train travels 62 miles every hours
Now divide the miles you need to go (868) by miles per hour (62)
868/62=14
So it will take the train 14 hours to travel 868 miles at a constant rate of 62mph
Snowpaw
Set up the problem: x mean you don't know yet

HOur : 3 / X
Miles: 186 / 868

3 is over 186 and X is over 868
You had to multiply 3 time 868 which is 2,604
186 time x is equal to X which is like this , 186X
Now, you divde 2,604 divide by 186 gives you 14
Answe: 14

Hope it help