Final answer:
The ordered pairs provided all show the friend arriving in half the time it takes you to arrive. There isn't an option where both you and your friend arrive at the same time, indicating a possible error in the question or missing information.
Step-by-step explanation:
The question asks which ordered pair represents arrival times for you and your friend to meet where both you and your friend arrive at the same time. To determine this, we assume that the first value in the ordered pair represents your arrival time and the second value represents your friend's arrival time.
Let's analyze the pairs:
- (10, 5)
- (20, 10)
- (30, 15)
- (25, 12.5)
All the ordered pairs given have a consistent pattern: the second number is exactly half the first. This means for each pair, your friend arrives exactly half the time it takes for you to arrive. Only an ordered pair where the two times are the same would represent a situation where you both arrive together.
Since none of the pairs meet this requirement, it seems there's an error, and none of the provided options represent a simultaneous arrival. Thus, the formulation of the question might be incorrect, or there may be a missing option that would correctly represent both of you arriving at the same time.