A man in train notice that he can count 51 telephone posts in 1 minute. If they are known to be 40 meters apart,then at what speed is the train traveling? Answers: A) 100km/hr B) 120km/hr C) 50km/hr D) 150km/hr E) 200km/hr
Number of gaps between 51 telephone posts = 50   Distance traveled in 1 minute = 50*40= 
<gadget id="calculator">50*40</gadget>
<output>2_000</output>
2000m= 2.0km   Speed = 60*2.0= 
<gadget id="calculator">60*2.0</gadget>
<output>120</output>
120km/hr   Answer is 120km/hr
<result>B</result>
A man in train notice that he can count 51 telephone posts in 1 minute. If they are known to be 40 meters apart,then at what speed is the train traveling?