Question

Train A, of length L metre running north-to-south, completely crosses a vertical pole in 9 seconds. Train B, 170m long, running south-to-north at a
speed of 15m/sec, crosses Train Ain 10 seconds. What is the value of L?​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

180m

Step-by-step explanation:

speed=distance/time

Speed of trainA:

speedA=L/9

for trainB:

since trainA and trainB are moving in opposite directions to get the relative speed you have to add speedOfTrainA and speedOfTrainB.

relative speed=speedA+speedB

total distance to cover is L+170

time is 10 seconds

(L+170)/10 = (speedA+speedB)

(L+170)/10 = ((L/9) + 15)

L = 180