Two trains 250 meters and 350 meters long respectively travel with uniform speeds on parallel lines from opposite directions. If they cross each other in 1 minute, and speed of one train be 30 km/hr, then speed of the second train is

A) 18 km/hr

B) 6 km/hr

C) 9 km/hr

D) 12 km/hr

Correct answer:
B) 6 km/hr

Description for Correct answer:

v + 30 = \( \Large \frac{250+350}{60} \times \frac{18}{5}km/hr \)

v + 30 =\( \Large \frac{600}{60} \times \frac{18}{5} km/hr \)

Therefore, v = 36 - 30 = 6 kmph.


Please provide the error details in above question

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