Correct Answer: Option D
Let the length of the train be x metres and its speed by y m/sec.
Then, x/y = 8
=> x = 8y
Now, (x + 264)/20 = y
=> 8y + 264 = 20y
=> y = 22.
So, Speed = 22 m/sec
= 22 x (18/5) km/hr
= 79.2 km/hr.
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