Question

a) A train is 160m long crosses person is 4 sec.
determine its speed in.
i. m/sec ii. km/hr​

Answer 1

Answer:

ii) km/hr

Step-by-step explanation:

because hr is also converted into second that's it

Answer 2

Answer:

72km /hr

Step-by-step explanation:

Speed = distance travelled / time taken

Here, distance travelled = length of the train + length of the platform

Because your train will be considered crossed the platform only after its full length has crossed the platform

Therefore, distance = 160+160 = 320m

Time = 16s

Speed = distance / time

Speed = 320/16 = 20m/sec

Now, convert it to km/h

Use the basic concept , 1m = 1/1000km

And 1sec = 1/3600 hr (1hr = 60min = 60*60sec)

Therefore, our speed = (20*3600)/1000 = 72km/hr