The train will travel at constant speed of 36mph, so the speed will not change throughout the journey and will remain the same.
We are asked how far the train will travel in 1 hour and 30 minutes.
We can first find how far the train will travel in an hour, which is 36 miles, since we are given the constant speed of 36mph, or miles per hour. So after 1 hour, the train traveled 36 miles, after 2 hours, the train traveled 72... just keep adding 36 miles after each hour.
Now we need to find how far the train can travel in 30 minutes, which is half of an hour. We can find that by dividing 36 by 2, since the train travels 36 miles in an hour and we need to find how far it travels in HALF of an hour. 36 dividied by 2 is 18. So the train can travel 18 miles in 30 minutes.
Now we will add our answers up.
36 miles + 18 miles = 54 miles
The train can travel 54 miles in 1 hour and 30 minutes.