SOLUTION: A train takes 3 seconds to enter a tunnel which is 1 km long. If it is traveling at 120 km per hour, how long will it take to pass completely through the tunnel?

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Question 708759: A train takes 3 seconds to enter a tunnel which is 1 km long. If it is traveling at 120 km per hour, how long will it take to pass completely through the tunnel?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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A train takes 3 seconds to enter a tunnel which is 1 km long.
If it is traveling at 120 km per hour, how long will it take to pass completely through the tunnel?
:
Find the speed in meters/sec when traveling at 120 kmh
%28120%2A1000%29%2F3600 = 33.33 meters/sec
:
Find the length of the train which takes 3 sec to enter the tunnel
3 * 33.333 = 100 meters
:
For the train to completely clear the tunnels it will have to travel 1100 meters (1km + 100m)
1100%2F33.333 = 30 seconds to completely pass trough the tunnel