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$27\frac{7}{9}$

$28\frac{7}{9}$

$29\frac{7}{9}$

$30\frac{7}{9}$

A. $27\frac{7}{9}$

As Trains are moving in same direction,

So, Relative Speed = 40-20 = 20 kmph

= 20*(5/18) = 50/9 m/sec

Length of Train= Speed * Time

$Length=\frac{50}{9}\times 5\phantom{\rule{0ex}{0ex}}=\frac{250}{9}=27\frac{7}{9}$