Question: How many miles will be traveled by at least 60% of the trucks?

C. (The number of miles that will be traveled by at least 60% of the trucks is__________?)

I don't know how to solve this question at all, if calculations are needed to solve it, I'd appreciate an explanation with Excel if possible, Thanks!

Previous work and context:

A trucking company determined that the distance traveled per truck per year is normally distributed, with a mean of 60 thousand miles and a standard deviation of 12 thousand miles. Complete parts (a) through (d) below. a. What proportion of trucks can be expected to travel between 42 and 60 thousand miles in a year? The proportion of trucks that can be expected to travel between 42 and 60 thousand miles in a year is 0.4332 . (Round to four decimal places as needed.) I). What percentage of trucks can be expected to travel either less than 45 or more than 80 thousand miles in a year? The percentage of trucks that can be expected to travel either less than 45 or more than 80 thousand miles in a year is 15.34 %. (Round to two decimal places as needed.) c. How many miles will he traveled by at least 60% of the trucks? The number of miles that will be traveled by at least 60% of the trucks is miles. (Round to the nearest mile as needed.)