Please help me

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?