A train has 11 passenger carriages. In any three consecutive passenger carriages, there are exactly 99 passengers. If there are 381 passengers in total, how many passengers are in carriage 9?
On a train there was 1 first class carriage, 1 buffet carriage and 4 second class carriages. In how many different ways can they be arranged if the second class carriages must be next to each other?
A train moving at 49 mph meets and is passed by a train moving at 63 mph. A passenger in the first train noted that the second train took 4.5 seconds to pass him. How long is the second train?
Find a way to write the digits 1 through 9 in sequence, so that the numbers determined by any two consecutive digits are divisible either by 7 or by 13.
On every moving railway carriage there are metal parts which are travelling in the opposite direction to the train and others which are travelling at twice the speed of the train. What are they?
