Question

length of platform on which a train 400m long travelling at 45km/hr can cross in 40 seconds is ​

Answer 1

Answer:

Length of train = 400 m

Length of bridge = 800 m

Total distance to cross (end to end) = 400+800 = 1200 m

Speed in m/s = 40×1000/3600 = 100/9 m/s

Total time to cross the bridge = distance / speed = 1200/100/9 = 108 sec = 1 min 48

Answer 2

length of train :

400m

speed:

45m/s

cross time:40 sec

speed=45*5/18=12.5 m/s

distance it will cover in 40 sec

= 40 *12.5=500m

so the length of platform=500-400=100 m

ANS:100m

help full to you plz mark me brilliant