Question 29
A train $X$ is travelling through the countryside at a constant speed of 90 km/h. Another train $Y$ of the same length is travelling in the opposite direction and it takes 5 seconds for both trains to pass by each other completely. Later, train $X$ enters a tunnel and it takes 50 seconds for the train to exit the tunnel completely. Find the length of the tunnel in metres.
Source note: the speed of train $Y$ is not specified.
Source note: the speed of train $Y$ is not specified.