A. 50 km/hr

B. 60 km/hr

C. 70 km/hr

D. 72 km/hr

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D

D

D. 72 km/hr

72

72

D

b

72

72km/hr

D

72km/hr

– Total Distance = 200m + 200m = 400m

Time = 20s

S= D/T

S= (400/20)m/s

S= 20m/s

20m/s – km/hr

20*18/5

= 72Km/hr

Train length= 200

Platform length= 200

Time = 20sec

Sum of lengths= time* speed

200+200= 20* speed

400=20*speed

Speed= 400/20

Speed=20 meter /sec

Convert it into hours i.e 20*18/5

Speed = 72km/hr

72 km/hr..

Speed of the train = Total length of the train + length of the platform

______________________________________

time

= 200 + 200

—————- = 20 m/s = 72 km/hr

20

72 km/hr

cos

a train is of length 200m and crosses the platform of same length 200m in 20 sec

so speed of train is 200+200/20=400/20 m/s

x=3600/20=180

multiply and divide by 180

400*180/20*180 m/s

72000/3600 m/s

72km/hr

D

If train length is 200

Platform Length is = train length

=200m + 200m=400m

=Speed= distance /time

=400/20=20m/s

=20*(18/5)=72km per hor

if train length is 200

platform length is = train length

=200+200=400m

speed=distance/time

=400/20=20m/s

=20*(18/5)=72km/h

72

D

72

Length of train ðŸš… = 200m

Platform length= 200m

Time = 20 seconds

So, total length = 200+200 = 400m

Speed = Distance/Time

400/ 20 = 20m/s

Convert into km/hr = 20m/sÃ— (18/5) = 72 km/ hr

72km/hr

72