-
A train passes two bridges of lengths 800 m and 400 m in 100 seconds and 60 seconds
respectively. The length of the train is :
-
- 80 m
- 90 m
- 200 m
- 150 m
Correct Option: C
When a train crosses a bridge it covers the distance equal to length of Bridge & its own length
Let the length of the train be = x
| ∴ Speed of the train = | m/s | |
| 100 |
Since train passes the 800 m bridge in 100 seconds.
Again, train passes the 400 m bridge in 60 seconds.
| ∴ | = 60 | |||||
| 100 | ||||||
| ⇒ | = 60 | |
| x + 800 |
⇒ 40000 + 100x
= 60x + 48000
⇒ 100x – 60x = 48000 – 40000
⇒ 40x = 8000
| ∴ x = | = 200m | |
| 40 |
