Question

11. If a train 200 m long takes 20s to cross a pole, then how much time does it take to cross a bridge of length 300 m (in seconds)?

(2) 30

(b) 40

(c) 50

(d) 63​

Answer 1

Answer:

Correct option is

2

30 sec

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

Answer:

TIME TAKEN TO REACH 200 M =20 SECONDS

TIME TAKEN TO REACH 1 M = 20/200 SECONDS

TIME TAKEN TO REACH 300 M=20/200*300

=30 seconds