Question

A train 270m long is running at 80 km/hr. How much time will it take to cross a platform 130m long? I have a doubt in this question how 5 bi 18 come​

Answer 1

Answer:

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Step-by-step explanation:

Total distance is 270+130 = 400 m

Speed in km/h is 80, to convert it into km multiply it by 5/18 = 80×5/18

= 200/9 m/s

Time is distance by speed = 400÷200/9

= 400×9/200

= 4×9/2

= 36/2 = 18 s

Doubt is how 5/18 came right.

We are converting km/hr into m/s

1 km is 1000 m

1 hr is 60 min

1 hr is 60×60 : 3600 sec

1 km/hr = 1000/3600 m/s

= 10/36 m/s

= 5/18 m/s

so, 5 km/h = 5×5/18 m/s

To convert m/s into km/h divide by 5/18.

10 m/s = 10÷5/18 km/h

= 10×18/5 km/h

= 36 km/h

Answer 2

Answer:

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