SOLUTION: A freight train with 75 cars is travelling 90km/h in a tunnel 150m long. How long will it take the train to travel completely through the tunnel if each car is 15m long?

Question 144790: A freight train with 75 cars is travelling 90km/h in a tunnel 150m long. How long will it take the train to travel completely through the tunnel if each car is 15m long?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A freight train with 75 cars is traveling 90km/h in a tunnel 150m long. How long will it take the train to travel completely through the tunnel if each car is 15m long?
:
Find the length of the train. 75 * 15 = 1125 meters, however, it says,
"75 cars" so it may not include the engine which, for example, a 3100 hp
locomotive is about 21 meters long, anyway ignoring that, and assuming the train is 1125 meters long>
:
The total distance from the end of the tunnel to the back of the train as the train just enters the tunnel: 1125 + 150 = 1275 meters = 1.275 km
:
Time = = .014167 * 60 = .85 min or about .85*60 = 51 seconds

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