The speed of an express train is x km/h and the speed of an ordinary train is 12 km /h less than that of the express train. If the ordinary train takes one hour longer than the express train to cover a distance of 240 km , find the speed of the express train.

An aeroplane covered a distance of 400 km at an average speed of x km/h. On the return journey, the speed was increased by 40 km/h . Write down an expression for the time taken for :

(i) the onward journey

(ii) the return journey

If the return journey took 30 minutes less than the onward journey , write down an equation in x and find its value.

A bus covers a distance of 240 km at a uniform speed. Due to heavy rain its speed gets reduced by 10 km/h and as such it takes two hours longer to cover the total distance. Assuming the uniform speed to be 'x' km/h, form an equation and solve it to evaluate x.

The distance by road between two towns A and B , is 216 km , and by rail it is 208 km. A car travels at a speed of x km/h, and the train travels at a speed which is 16 km/h faster than the car. Calculate :

(i) The time taken by car , to reach town B from A, in terms of x.

(ii) The time taken by the train , to reach town B from A, in terms of x.

(iii) If the train takes 2 hours less than the car, to reach town B , obtain an equation in x, and solve it.

(iv) Hence, find the speed of the train.