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The speed of the train passing through the tunnels and bridges of different lengths at a constant speed

작성자 Uploader : 도깨비 작성일 Upload Date: 2019-02-15변경일 Update Date: 2019-02-27조회수 View : 257

When a train running at a constant speed takes the time T1 (s) passing through a tunnel of length L1 (m) and takes the time T2 (s) passing through a bridge of length L2 (m), the speed V (m/s) can be obtained as follows.

Letting the length of the train as LT, the time required to pass through the tunnel and bridge is as follows.

T1 = (L1 + LT) / V → LT = T1 * V - L1
T2 = (L2 + LT) / V → LT = T2 * V - L2

Solving the two expressions together, we get:

T1 * V - L1 = T2 * V - L2

V = (L1-L2) / (T1-T2)


*** 참고문헌[References] ***
V = (L1-L2)/(T1-T2)
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변수명 Variable 변수값 Value 변 수 설 명 Description of the variable


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