If the lifetime of an electronic equipment follows an Exponential Distribution with parameter 0.1 hour. Given that it has already lasted for 10 hours, what is the conditional probability that it lasts for more than 25 hours?

I know the two formulas for if it will last up to a certain number of hours (1-e^(-0.1*x)) and if it will last more than a number of hours (e^(-0.1*x)). But I really cannot figure out how to find this conditional probability. Any help would be awesome! Thanks