A train moves fast a telegraph post and a bridge 264 m long in 8 sec and 20 sec respectively. What is the speed of the train?	Select:	A) 79.7	B) 79.9	C) 79.5	D) 79.2	E) 79.1
Let the length of the train be x m and its speed be y m/sec.   Then, x/y = 8 =&gt; x = 8y   (x + 264)/20 = y   y = 22   Speed = 22 m/sec = 22 * 18/5= 
<gadget id="calculator">22 * 18/5</gadget>
<output>396/5 = around 79.2</output>
79.2 km/hr.   Answer: 79.2
<result>D</result>
A train moves fast a telegraph post and a bridge 264 m long in 8 sec and 20 sec respectively. What is the speed of the train?