Along distance runner starts at the beginning of a trail and runs at a rate of 5 miles per hour. one hour later, a cyclist starts at the beginning of the trail and travels at a rate of 13 miles per hour. what is the amount of time that the cyclist travels before overtaking the runner?

my answer is 37.5 minutes but it has to be in where am i going wrong?

Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point