q: A 120 meter long train crosses a man standing on the platform in 6 sec. What is the speed of the train?
Options:
(A) 229
(B) 108
(C) 278
(D) 72
(E) 112
a: OK... S = 120/6 * 18/5 = 72 kmph
The answer is (D).

q: How many terminating zeroes T does 200! have?
Options:
(A) 40
(B) 48
(C) 49
(D) 55
(E) 64
a: OK... You have 40 multiples of 5, 8 of 25 and 1 of 125. This will give 49 zeros.
The answer is (C).

q: If a man can cover 12 metres in one second, how many kilometres can he cover in 3 hours 45 minutes?
Options:
(A) 118 km
(B) 162 km
(C) 1767 km
(D) 1887 km
(E) 177 km
a:
OK... 12 m/s = 12 * 18/5 kmph
3 hours 45 minutes = 3 3/4 hours = 15/4 hours
Distance = speed * time = 12 * 18/5 * 15/4 km = 162 km.
The answer is (B).