A man in a train notices that he can count 41 telephone posts in one minute. If they are known to be 50 metres apart, then at what speed is the train travelling?
Pick.
A) 620 km/hr  B) 220 km/hr  C) 220 km/hr  D) 120 km/hr  E) 203 km/hr
Explanation:   Number of gaps between 41 poles = 40   So total distance between 41 poles = 40*50= 
<gadget id="calculator">40*50</gadget>
<output>2_000</output>
2000 meter= 2 km   In 1 minute train is moving 2 km/minute.   Speed in hour = 2*60= 
<gadget id="calculator">2*60</gadget>
<output>120</output>
120 km/hour   Answer: 120 km/hr
<result>D</result>
A man in a train notices that he can count 41 telephone posts in one minute. If they are known to be 50 metres apart, then at what speed is the train travelling?