Question
Aruna is sitting inside train P which is travelling at a
speed of 60 km/h. Another train Q, whose length is twice the length of train P and travelling with a speed of 70 km/h (in opposite direction to that of train P) crosses Aruna in 12 seconds. Find the approximate length of train P (in metres).Solution
ATQ,
Relative speed = 60 + 70 = 130 km/h = 130 × 5/18 = 36.11 m/s
Let the length of train P be ‘x’ meters
So, 2x = 36.11 × 12
Or, 2x = 433.32
Or, x = 216.66 ≈ 216 metres
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