A railway passenger counts the telegraph poles on the rail road as he passes them. The telegraph poles are at a distance of 50 metres. What will be his count in 4 hours, if the speed of the train is 45 km per hour.

Explanation:-

In train he travels = 4*45 = 180 km = 180000 m
Thus, the no. of poles,
= ¹⁸⁰⁰⁰⁰/₅₀ = 3600. [Poles are at the distance of 50 m.]