A. 69.5 km/hr
B. 70 km/hr
C. 79 km/hr
D. 79.2 km/hr
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
=> Speed = 22 m/sec = [ 22 x (18/5) ] km/hr = 79.2 km/hr
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