In what time will a train 300 meters long cross an electric pole, if its speed is 90 km/hr
Choose the correct choice from the following answers:
A) 5 seconds B) 12 seconds C) 3 seconds D) 2.5 seconds E) None of these
Explanation:   First convert speed into m/sec   Speed = 90*(5/18)= 
<gadget id="calculator">90*(5/18)</gadget>
<output>25</output>
25 m/sec   Time= Distance/speed   = 300/25= 
<gadget id="calculator">300/25</gadget>
<output>12</output>
12 seconds   Answer: 12 seconds
<result>B</result>
In what time will a train 300 meters long cross an electric pole, if its speed is 90 km/hr