Question

A 150 m long train passes a pole in 3 seconds then

find the type taken by the train to cross a bridge of

length 850 m.


(1) 50 s (2) 20 s

(3) 30 s (4) 40 s​

Answer 1

Answer:

Length of the train = 150 m

Length of the train = 500 m

∴ Total length =(500+150)m=650m

∴ Speed of the train =

30

650

m/sec=21

3

2

m/sec

Now total length of the train and new bridge =(370+150)m=520m

∴ Time taken =

65

520×3

sec=24sec

Answer 2

Explanation:

velocity of train v=150/3=50m/s

time taken by the train to cross bridge

t=(850+150)/50=1000/50

t=20 sec