# Some telegraph poles are placed 20 m apart. How many poles will a train pass in 3-hours at 60km/h

2
by mushinibharat2

2014-10-28T21:52:21+05:30
Distance travelled by the train in 3 hrs at 60kmph is
speed*distance=60*3= 180kms.
180 kms = 180000meters..
Therefore no of poles is 180000/20 =9000
2014-10-29T12:03:44+05:30

### This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Distance between two poles = 20m
in three hours at the speed of 60 km/h,
total distance travelled = 60×3 = 180 km
180 km = 180×1000 m = 1,80,000 m

number of poles in an interval of 20m = 2(one at starting and one at 20m)
number of poles in an interval of 40m = 3(one at starting, one at middle and one at 40m)
It is always 1 greater than (distance/20)

So number of poles = 180000/20 + 1 = 9000+1 = 9001