Question

1) In what time will a train 100 metres long cross an electric pole, If it's speed be 144 km/hr ? a) 2.8 secs b) 4.25 secs c)2.5 secs d) 12.5 secs

Answer 1

c)2•5 sec
the speed is 144 km/hr= 40m/s
distance is =100m
time = distance/ speed
= 100/40= 2.5sec