1.

1). 300 metres 2). 450 metres3). 400 metres4). 350 metres

Answer»

SPEED of train A, SA = 36 km/h = 36 × (1000/3600) m/s = 10 m/s

Speed of train A, SB = 54 km/h = 54 × (1000/3600) m/s = 15 m/s

Length of train A, La = 250 m

Time TAKEN for train B to overtake train A = 2 min = 120 s

Let the length of train B be Lb.

Time taken to overtake train A by train B = (La + Lb)/(SB – SA)

⇒ (250 + Lb)/(15 – 10) = 120

⇒ 250 + Lb = 600

⇒ Lb = 350 m

∴ length of train B is 350 m.



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