Two trains each 300 In. in length are running on the parallel lines in opposite directions with the speeds of 70 km/hr. and 50 km/hr respectively. In how much time will they cross each other completely?

A) 18 sec

B) 12 sec

C) 10 sec

D) 11 sec

Correct answer:
A) 18 sec

Description for Correct answer:
t = \( \Large \frac{ \left(300+300\right) }{ \left(70+50\right)\frac{5}{18} } \) = 18 sec.

Please provide the error details in above question

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