(A) 69.5 km/hr
(B) 70 km/hr
(C) 79 km/hr
(D) 79.2 km/hr
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(A) 69.5 km/hr
(B) 70 km/hr
(C) 79 km/hr
(D) 79.2 km/hr
Answer: Option (D) 79.2 km/hr
Explanation:
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.
Therefore Speed = 22 m/sec = 22 x (18/5) km/hr = 79.2 km/hr.