Question

train 420 metres long crosses an electric pole in 35 seconds. Find the speed of the train in km/hr.​

Answer 1

Answer:

speed=distance ÷ time ,420÷35=12m/s

Answer 2

Required Answer :

The speed of train in km/h = 43.2 km/h

Given :

• Distance travelled by the train = 420 metres
• Time = 35 seconds

To find :

• Speed of the train in km/hr

Knowledge required :

Formula to calculate the speed of a body, when distance and time is given :

• S = D/T

where,

• S denotes the speed of the body
• D denotes the distance travelled by the body
• T denotes the time taken by the body

Solution :

Substituting the given values in the formula of speed :

⇒ Speed of the train = 420/35

⇒ Speed of the train = 84/7

⇒ Speed of the train = 12

• The speed of the train in m/s = 12 m/s

Now, let's convert it into km/h :

To convert the speed into km/h, multiply it by 18/5.

⇒ Speed of the train = 12 × 18/5

⇒ Speed of the train = 216/5

⇒ Speed of the train = 43.2

Therefore,

• The speed of train in km/h = 43.2 km/h