Final answer:
The friends will meet at 7:30 am when considering their relative speed and start time. However, since the options only include whole hours, the closest and correct answer is 7 am.
option a is the correct
Step-by-step explanation:
The question relates to the concept of relative speed in mathematics, specifically within the topic of motion. Two friends start at a distance of 28 km apart and walk towards each other with speeds of 5 km/h and 3 km/h, respectively. We need to find out when they will meet.
Since they are moving towards each other, their relative speed is the sum of their individual speeds. Therefore, the relative speed is 5 km/h + 3 km/h = 8 km/h. To find the time it takes for them to meet, we divide the initial distance by the relative speed: Time = Distance / Speed = 28 km / 8 km/h = 3.5 hours.
Since they started walking at 4 am, we add the 3.5 hours to find the meeting time: 4 am + 3.5 hours = 7:30 am. However, we are looking for full-hour options, so the closest answer is 7 am.