SOLUTION: An express train takes 3 seconds to enter a tunnel one kilometer long.if it is traveling at 120 km/hr,how long will it take to pass through the tunnel?

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Question 450526: An express train takes 3 seconds to enter a tunnel one kilometer long.if it is traveling at 120 km/hr,how long will it take to pass through the tunnel?
Answer by stanbon(75887) About Me  (Show Source):
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An express train takes 3 seconds to enter a tunnel one kilometer long.if it is traveling at 120 km/hr,how long will it take to pass through the tunnel?
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Length of the train = (rate)(time)
= (120km/hr)(3 seconds)
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= 120 km/(3600 sec))(3sec) = 120/1200 km
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= 1/10 km (the train's length)
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Let distance be tunnel length + train length.
---
time = distance / rate
---
time = 1.1 km/(120km/hr)
= (1.1/120) hr
---
= 0.009167 hr
= 0.55 minutes
= 33 seconds
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Cheers,
Stan H.
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