A train travelling at a constant speed takes 20 seconds from the the time its first enters a tunnel that is 300 meters long until 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 length of the train.
2007-02-25 09:48:50 · 2 answers · asked by Anonymous in Education & Reference ➔ Homework Help
Remember,
Rate x Time = Distance
So, for your problem, let's find how fast (rate) the train is going.
Rate x 20 seconds = 300 m
Rate = 300 m / 20 seconds
Rate = 15 m/s
The train is under the light for 10 seconds.
If the train goes 15 m/s then you know the train is:
15 m/s x 10 seconds = 150 meters long.
Regards,
Mysstere
2007-02-25 09:55:36 · answer #1 · answered by mysstere 5 · 0⤊ 0⤋
Err... 150 meters. If a staionary light is shining on the train for 10 seconds, one half of the time, and the rest of the time it's not, the train is about half the length of the tunnel.
2007-02-25 17:57:22 · answer #2 · answered by Blorange the Orange 2 · 0⤊ 0⤋