OK TL....this is for you.
THE MORNING JOURNEY:
The journey took 65 minutes. Why? The narrator of the riddle stated that it arrived 5 minutes late for a 60 minute journey. That is the correct time as it's not based off of any clocks mentioned in the riddle. Mr. Grumper thinking that his watch was 3 minutes SLOW set it to be the same time as the station clock (3 minutes forward).
THE EVENING JOURNEY:
This journey left on time according to the watch (which we know is 3 minutes fast as is from the morning journey). Also, the train arrived on time according to the station clock. We were told that the train was 25% faster than the morning trip. So, since we know the morning trip took 65 minutes, we divide that by 1.25 which gives us 52 minutes. BUT, as was stated in the riddle, the train arrived for the original journey 5 minutes late, which in turn (because Mr. Grumper set his watch to show that the train was on time) means that the evening trip actually was 5 minutes later. So the evening trip actually took 57 minutes. If the station clock said that this was on time, this makes the station clock 3 minutes fast. 60-57=3![]()



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