Question

convert 25 m/s into km/h

Answer 1

Given :  25 m/s

To Find : Convert  in km/hr

Solution:

25 m/s

= 25 m  x  1/ sec

1  km  = 1000 m

=> 1/1000 km = 1 m

so to convert m in km  we need to multiply by 1/1000

or divide by 1000

=> 25  m  =  25 /1000

1 hr  = 3600 sec

=> 1 sec  =  1/ 3600 hr

=> 1/ 1 sec   =  3600/ hr

25 m/s   =  (25 /1000 ) * 3600   = 90 km/hr

or  25 m/s     =    25  x   3600 / 1000  

= 25 x 36/ 10

= 5 * 36 / 2

= 5 * 18

= 90 km/hr

Direct formula:  to convert m/s in km/hr  

multiply by  18/5

x m/s  = 18x/5 km/hr

and  

x km/hr  = 5x/18  m/s

25 m/s  = 90 km/hr  

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Answer 2

SOLUTION

TO DETERMINE

Convert 25 m/s into km/h

EVALUATION

Here the given speed is 25 m/s

Now

1 hour = 3600 seconds

1 km = 1000 metre

Hence Converting 25 m/s into km/h we get

$\displaystyle \sf{ = \frac{25 \times 3600}{1000} \: \: \: km/h}$

$\displaystyle \sf{ = \frac{25 \times 36}{10} \: \: \: km/h}$

$\displaystyle \sf{ = 90 \: \: \: km/h}$

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