Question

A man traveling in a train noticed that he passes a telegraphy Pole every 5secs he knows that the pole are 125m apart what speed does he deduce that the train is traveling in kmh

Answer 1

The speed is

$$v=\frac{s}{t}=\frac{125}{5}=25\frac{m}{s}$$

$$v=(3.6)25=90\frac{km}{h}$$