A runner has a stride length of 5 feet for the first half of the race and a stride length of 4.5 feet for the second half. How many strides would it take to finish the second half of the marathon?

Hint: 5 ft is 5.0 x 10
4.5 is 4.5 10

Online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown.

How long is a marathon? Don't understand your hint. Typos?