In what time will a train 90 meters long cross an electric pole, if its speed is 124 km/hr Choose the correct answer
A) 5 seconds B) 4.5 seconds C) 3 seconds D) 2.6 seconds E) None of these
Explanation:   First convert speed into m/sec   Speed = 124*(5/18) = 34 m/sec   Time = 2.6 secondsistance/speed   = 90/34 = 2.6 seconds   Option 2.6 seconds
<result>D</result>
In what time will a train 90 meters long cross an electric pole, if its speed is 124 km/hr