Question

4oom
bridge with
the time
A 200 m long train Guess
Gross a long
a speed of 36 km/hr. calculate
taken
bey
the
train to cross the bridge.​

Answer 1

the time taken will be 1 minute.

as first the engine of train enters and then the whole train passes and finally the last point in the train crosses the bridge.  

So, total distance covered by the train = Length of bridge + it's own length

=> (200+400)m

=> 600 m.  

Speed = 36 kmph = 10m/s  

Hence, time taken = 600/10 s = 60s = 1min

OR

D=200 m+400 m=600 m

S=36km/h=36×5÷18=10 m/sec

T=?

T=D÷S

T=600÷10

T=60 sec  

i hope this may help u.