(A) 30 km/hr
(B) 45 km/hr
(C) 60 km/hr
(D) 75 km/hr
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(A) 30 km/hr
(B) 45 km/hr
(C) 60 km/hr
(D) 75 km/hr
Answer: Option (C) 60 km/hr
Explanation:
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.
(100 + 100)/8 = 3x
24x = 200
x = 25/3 .
So, speed of the faster train = 50/3 m/sec
= (50/3) x (18/5) km/hr
= 60 km/hr.