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express a speed of 30m/s in km/h

The given speed is 30 m/s.

⇒ Distance travel by object in 1 sec = 30 m

∴ Distance travel by object in 3600 sec or 1 hour = 3600 × 30 m  

⇒ Distance travel by object in 1 hour = 108000 m  

⇒ Distance travel by object in 1 hour = 108000/1000 km  

⇒ Distance travel by object in 1 hour = 108 km  

∴ Speed of object = 108 km/hr 

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JOHNY the answer is too simple just u have to multip;ly the given number by30 x 1000 / 1800 because 1000m = `1km and 1800s = 1 hr

 

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sorry! ihave mistaken 3600 = 1hr

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now there can be a thumbs up plz.........

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1km=1000m

1 min=60sec

1 hr =60min

so 30m/s=30*1000/60*60=

=300/36=8.33km/hr

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it is 30/1000*3600=108m/s

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