There are four platforms at a railway station, each opening at different times: Platform 1 at 5am, Platform 2 at 6am, Platform 3 at 7am, and Platform 4 at 8am. Trains arrive at these platforms one after another with a one-hour gap between arrivals on the same platform. Multiple trains can arrive on the same platform but always with a one-hour interval.

Given the following information:

1. Train M is not the only train arriving on its platform.
2. Train D arrives immediately before train B on the same platform.
3. There is a one-hour gap between the arrivals of train G and train H on the same platform.
4. No train arrives after train C, which arrives at 6am on one of the platforms.
5. Trains G and B arrive at the same time, and train B arrives on platform 1.
6. The train that arrives first at 5am on platform 1 also arrives next at 7am on platform 3.
7. Train K arrives on platform 1 before train S, who arrives on platform 2.
8. Train H arrives on platform 2 at 7am.

Based on this information, which of the following is the correct platform and time for the train that arrives just before train M on the same platform?

Question

There are four platforms at a railway station, each opening at different times: Platform 1 at 5am, Platform 2 at 6am, Platform 3 at 7am, and Platform 4 at 8am. Trains arrive at these platforms one after another with a one-hour gap between arrivals on the same platform. Multiple trains can arrive on the same platform but always with a one-hour interval.

Given the following information:

1. Train M is not the only train arriving on its platform.
2. Train D arrives immediately before train B on the same platform.
3. There is a one-hour gap between the arrivals of train G and train H on the same platform.
4. No train arrives after train C, which arrives at 6am on one of the platforms.
5. Trains G and B arrive at the same time, and train B arrives on platform 1.
6. The train that arrives first at 5am on platform 1 also arrives next at 7am on platform 3.
7. Train K arrives on platform 1 before train S, who arrives on platform 2.
8. Train H arrives on platform 2 at 7am.

Based on this information, which of the following is the correct platform and time for the train that arrives just before train M on the same platform?

Accepted Answer

**Solution:**

1. From the given data, the train M is not the only train on its platform, so there must be at least one train arriving before M on the same platform.

2. Train D arrives immediately before train B on the same platform, and train B arrives on platform 1 at 8am. Therefore, train D arrives on platform 1 at 7am.

3. Train H arrives on platform 2 at 7am, and train G arrives on the same platform one hour apart, so G arrives at 8am on platform 2.

4. Train C arrives at 6am on one of the platforms, and no train arrives after C on that platform.

5. Train B and train G arrive at the same time (8am), with B on platform 1 and G on platform 2.

6. The train that arrives first at 5am on platform 1 also arrives at 7am on platform 3. From the arrangement, this train is K.

7. Train K arrives on platform 1 before train S, who arrives on platform 2.

8. The train M arrives on platform 3 at 8am. The train arriving just before M on platform 3 is at 7am, which is train K.

Hence, the train arriving just before M is on platform 3 at 7am.

**Answer:** Platform 3, 7am

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