A. The length of time it takes for Gandolf's fireworks to explode after they are launched is presumed to be uniformly distributed. If the length of time it takes them to explode occurs over the interval of 10 to 25 seconds, inclusive, then what is the probability that it will take BETWEEN 20 and 22 seconds for one to explode after it is launched?
B. The length of time it takes for Gandolf's fireworks to explode after they are launched is presumed to be uniformly distributed. If the length of time it takes them to explode occurs over the interval of 10 to 25 seconds, inclusive, then what is the probability that it will take less than 20 seconds for one to explode after it is launched?