Question

A man in a train notices that he can count 21 telephone posts in one minute. if they are known to be 50 metres apart, then at what speed is the train travelling?

Answer 1

the distance between the two posts is 50

so distance between 21 posts = 20 ×50 =1000 meters


in a minute train travels 1000 meters

i.e. 1 km per minute

so 60 km in 60 min

i.e. train travels at 60 km / hr

Answer 2

Answer:

60kmph

Step-by-step explanation:

the distance between 21 posts is 20 and they are known to be 50m

so,20*50=1000m which is 1km

speed=distance/time

speed=1/(1/60)

speed=60kmph