In what time will a train 200 meters long cross an electric pole, if its speed is 128 km/hr  Pick one.
A) 5 seconds  B) 5.7 seconds  C) 3 seconds  D) 2.5 seconds  E) None of these
Explanation:   First convert speed into m/sec   Speed = 128*(5/18) = 35 m/sec   Time = Distance/speed   = 200/35 = 5.7 seconds   Option 5.7 seconds
<result>B</result>
In what time will a train 200 meters long cross an electric pole, if its speed is 128 km/hr