SOLUTION: A train goes past you in 10 seconds and goes past a 100 meter long bridge in 30 seconds. What is the length (in meters) and the speed (inm/s) of the train?
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Question 1161836: A train goes past you in 10 seconds and goes past a 100 meter long bridge in 30 seconds. What is the length (in meters) and the speed (inm/s) of the train? Answer by ikleyn(52884) (Show Source):
Let d be the length of the train.
Then from the condition, the speed of the train is v = meters per second.
The equation regarding moving over the bridge is
30*v = 100 + d.
Substitute here v = and then solve for d
= 100 + d
3d = 100 + d
2d = 100
d = 100/2 = 50 meters is the length of the train. ANSWER
And its speed is then = 5 m/s. ANSWER
