<PRE><B>Question 306688</B>
A train is 90 meters long and enters a 310 meter long tunnel at a speed of  4 m/s . how much time in seconds will the train take to pass completely through the tunnel ?

length of train 90 meters
length of tunnel 310 meters

if the train has to get out completely from the tunnel it has to travel 310 +90 meters

=400 meters

speed of train = 4 m /sec

time taken = distance / speed

= 400/4

= 100 seconds

train will take 100 sconds.

</PRE>