Question

a train is moving with a velocity of 45km/hr . calculate the distance travelled by it in 1hr , 1min , 1second.

Answer 1

DISTANCE TRAVELED IN 1 HOUR
Speed = 45 km/hr
Time = 1 hr
Distance = speed x time 
= 45 x 1 
= 45 km ( 45000 m) 
∴ the train travels 45 km in 1 hour. 

DISTANCE IN 1 MINUTE
Speed = 45 km/hr or we can also take as
45000 m/ 60 min
Time = 1 min
Distance = speed x time 
=( 45000/60 ) x 1
= 45000 / 60 
= 750 metres
∴ the train travels 750 m in 1 minute

DISTANCE IN 1 SECOND
Speed = 45000 m/ 60 min (or ) 
45000 m/ 3600sec
Time = 1 second 
Distance = speed x time 
= (45000 / 3600) x 1
= 45000 / 3600
= 12.5 metres
∴ the train travels 12.5 m in 1 second. 

Answer 2

given  

velocity = 45 km/hr 

distance =velocity* time 
               =45 kmph*1hr

so distance covered in 1 hour =45 km =45000m

distance covered in 1 minute =45*1/60 =0.75 km=750m

distance covered in 1 second =45* 1/3600=0.0125 km=12.5m


hope helped!