SOLUTION: It takes a train 7 seconds to pass by a stationary observer and 26 seconds to travel the length of a station 380 meters long. What is the speed of the train and its length?

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Question 221465: It takes a train 7 seconds to pass by a stationary observer and 26 seconds to travel the length of a station 380 meters long. What is the speed of the train and its length?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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It takes a train 7 seconds to pass by a stationary observer and 26 seconds to travel the length of a station 380 meters long.
What is the speed of the train and its length?
:
let s = speed of the train in meters/sec
:
7s = length of the train
:
time of the front of the train passing the platform
It passes the platform 26-7 = 19 sec
:
s = 380%2F19
s = 20 meters/sec
:
Train length = 7s
7(20) = 140 meters long
:
The speed of train in km/hr = %283600%2A20%29%2F1000 = 72 km/hr