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 ?
Options:
A) 69.5 km/hr	B) 70 km/hr	C) 79 km/hr	D) 79.2 km/hr	E) 79.5 km/hr
Explanation:   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 IS 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 ?