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 ? Choose the correct option.
A) 79.0
B) 79:9
C) 79.1
D) 79.2
E) 79.4
Let the length of the train be x metres and its speed by y m/sec.   Then,   Now,   8y + 264 = 20y   y = 22.   Speed = 22 m/sec =km/hr = 79.2 km/hr.   Answer: 79.2) 79.2 km/hr
<result>D</result>
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 ?