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Two trains are travelling in the same direction on parallel tracks. Train A is travelling at 30 km/h and Train B is travelling at 60 km/h. If Train A
Question

Two trains are travelling in the same direction on parallel tracks. Train A is travelling at 30 km/h and Train B is travelling at 60 km/h. If Train A is 400 m long and it takes Train B two minutes to pass Train A, what is the length of Train B?

A.

700 m

B.

500 m 

C.

400 m

D.

600 m

Correct option is D

Total distance (i.e Total Length)= Relative Speed ×\times  Time

400 + lbl_b = (60-30)×518\frac{5}{18}× 2× 60 

lb=l_b=  1000-400 = 600 m​



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