Vishwanath
Monday, February 18, 2013
41.A train moves past a telegraph post and a bridge 264 m long in 8 seconds and 20 seconds respectively. What is the speed of the train?
A. 69.5 km/hr
B. 70 km/hr
C. 79 km/hr
D. 79.2 km/hr
Option:D
Let the length of the train be x metres and its speed by y m/sec.
⇒ 8y + 264 = 20y⇒ y = 22.
∴ Speed = 22 m/sec = |
| 22 x |
18 |
| km/hr = 79.2 km/hr. | 5 |
|
Title : Trains Q41
Description : 41.A train moves past a telegraph post and a bridge 264 m long in 8 seconds and 20 seconds respectively. What is the speed of the train? ...
Rating : 5
