A train moves past a telegraph post and a bridge 264 m long in 8 seconds and 20 seconds respectively. What is the speed of the train?

$$\frac{L}{8} = \frac{264+L}{20}$$
Speed of train = $$\frac{176}{8}$$ = 22 m/s = $$22 \times \frac{18}{5}$$ = 79.2 km/hr