My alternative solution:
Let's rid out of the delayed bus and continue with just one bus that left earlier. What does it give us?
The bus can handle distance between M and N for 4 hours. P is the midpoint between the cities.
According to the question stem, one bus left 36 min earlier and another delayed for 24 min. It is the same as saying that early-bird bus left 60 min earlier (24+36 = 60).
Let's say that he must have been living at 8 am, but he actually left at 7 am.
So, at 10 am. Planned
...
Let's rid out of the delayed bus and continue with just one bus that left earlier. What does it give us?
The bus can handle distance between M and N for 4 hours. P is the midpoint between the cities.
According to the question stem, one bus left 36 min earlier and another delayed for 24 min. It is the same as saying that early-bird bus left 60 min earlier (24+36 = 60).
Let's say that he must have been living at 8 am, but he actually left at 7 am.
So, at 10 am. Planned
...
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