Question

a train whose length is 150m passed talegraph pole in 10 sec find speed in km/hr

Answer 1

Heya Frnd. ......... ☺

$speed \: = \: \frac{distance}{time}$

=> 150/10

15 m/s ________( 1 )

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Now,

For getting the speed in Km/h , we multiply it by 18/5.

So,

$15 \: \times \: \frac{18}{5}$

$= > \boxed{53.99 \: kmph}$

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☆ For getting 18/5 ,

We divide hr/km in the form of seconds/metres

=> 3600 seconds/ 1000 metres

=> 18/ 5 .......... ☺



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Answer 2

Speed = Distance / Time

            = 150 / 10

            = 15 m/s
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To convert it into km/hr then,

= 15 × 18/5

= 3 × 18

= 54 km/hr.
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Note: To convert it into km/hr we multiply 3600/1000 = 18/5.
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