Pls me asap for 3, 4, and 5 (show ) + lots of points!

Number 3 is a because for every hour (x) the train travels 50 miles (y) so the total distance will be 50 times the number of hours (50x)

For number 3, the answer will be B because I use the formula of y/x which is 60/1, 120/2, 180/3, 240/4, and 300/5 which is y=60x. For number 4, I know that it will travel 60 miles per hour, so I just need to take 450 divided for 60 to get how long does it took to travel for 450 miles which equal 7.5 hours or 7 1/2 hours which is A. For number 5, I know that 6 3/4 hour will also equal to 6.75 hours. Now, I just need to take 60 times 6.75 to see how many miles does it took to travel for 6.75 hours which equal 405 miles which is C. Hope it help!