In what time will a train 180 meters long cross an electric pole, if its speed is 154 km/hr Choose the correct option.
A) 5 seconds
B) 4.3 seconds
C) 3 seconds
D) 2.5 seconds
E) None of these
Explanation:   First convert speed into m/sec   Speed = 154*(5/18) = 42 m/sec   Time = Distance/speed   = 180/42 = 4.3 seconds   Option 4.3 seconds
<result>B</result>
In what time will a train 180 meters long cross an electric pole, if its speed is 154 km/hr