Answer: Option B
Speed of train relative to man = (60 + 6) km/hr = 66 km/hr.
Answer: Option D
Distance covered in crossing each other = (140 + 160) m = 300 m.
Answer: Option C
Let the speed of the slower train be x m/sec.
Then, speed of the faster train = 2x m/sec.
Relative speed = (x + 2x) m/sec = 3x m/sec.
24x = 200
= 60 km/hr.
Time = 26 sec.
Let the length of the train be x metres.
x + 250 = 520
x = 270.