Q 1414412359.     A train passes two persons who are walking in the direction opposite to the direction of train at the rate of `10` rn/s and `20` m/s respectively in `12` s and `10` s, respectively. Find the length of the train.

A

`500` m

B

`900 ` m

C

`400 ` m

D

`600 ` m

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