Q: A train 90 meters long completely crosses a 200 meters long bridge in 36 seconds. What is the speed of the train is?
Options:
(A) 29
(B) 40
(C) 25
(D) 66
(E) 09
A: OK... Stream of consciousness: S = (90 + 200)/36 = 290/36 * 18/5 = 29
The answer is (A).

Q: What is the median from the below series
90, 92, 93, 88, 95, 88, 97, 87, and 98
Options:
(A) 85
(B) 89
(C) 92
(D) 98
(E) 100
A: OK... Stream of consciousness: Ordering the data from least to greatest, we get:
87, 88, 88, 90, 92, 93, 95, 96, 98
The median score is 92.
The answer is (C).

Q: A 600 meter long train crosses a signal post in 50 seconds. How long will it take to cross a 3 kilometer long bridge, at the same speed?
Options:
(A) 4 min
(B) 2 min
(C) 8 min
(D) 9 min
(E) 5 min
A: OK... Stream of consciousness: S = 600/50 = 12 mps
S = 3600/12 = 300 sec = 5 min
The answer is (E).

Q: The edge of a cube is 9a cm. Find its surface?
Options:
(A) 153a2 cm2
(B) 143a2 cm2
(C) 233a2 cm2
(D) 243a2 cm2
(E) 253a2 cm2
A:
OK... Stream of consciousness: 6a2 = 6 * 9a * 9a = 243a2
The answer is (D).