Every hour, a runner is able to run the same number of miles. If on his 3rd hour of running he has gone 15 miles, and on his 5th hour of running he has gone 25 miles, what is the rate at which he runs?

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?