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

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speed*distance=60*3= 180kms.

180 kms = 180000meters..

Therefore no of poles is 180000/20 =9000

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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**

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 =