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A train, x meters long, traveling at a constant speed, takes 20 seconds from the time it first enters a tunnel 300 meters long until the time it completely emerges from the tunnel.  One of the stationary ceiling lights in the tunnel is directly above the train for 10 seconds.  Find the value of x.

 Dec 7, 2019
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Let the average speed of the train =S
(x + 300) / 20 =S
x / 10 = S, solve for x, S
S = 30 m/s.
x = 300 meters - the length of the train.

 Dec 7, 2019

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