Final answer:
The temporary P-M must be present for at least 7 hours. Probability questions require a frame of reference for the time period to calculate the chance of an event occurring within a specified timeframe, and time calculations help determine end times after a series of events.
Step-by-step explanation:
The question seems to be related to probability and time calculations. When considering a temporary P-M (possibly meaning PM or post meridian), which is the period after noon and before midnight, we typically measure time in hours, minutes, and seconds. If we assume the P-M is in place for 'half-power for 24 hours' or 'only on for 12 hours,' both would mean the P-M is expected to last 12 hours, thus the correct answer would be (c) is at least seven hours.
In the context of probability, question 59 is asking about the chance that an event occurs within the first half-hour or the last hour between 4 p.m. and 7 p.m. To calculate this, we look at the total time frame (3 hours) and the stated times (1.5 hours in total), leading us to determine the probability based on the ratio of these times.
Regarding the calculation of time after certain activities, adding the minutes and converting them into hours as shown in the provided solution helps to determine that arriving at a friend's house at 3:00 pm after starting at 1:00 pm would be correct if the activities total up to 2 hours.
Lastly, the question about the delivery day past noon and waiting for at least 1.5 more hours is a probability question that seems to be missing vital information to determine the probability value. Without a frame of reference or additional data, we cannot calculate the probability.