q: A train 400 meters long completely crosses a 300 meters long bridge in 45 seconds. What is the speed of the train is?
Options:
(A) 32
(B) 56
(C) 29
(D) 27
(E) 21
a: Stream of consciousness: S = (400 + 300)/45 = 700/45 * 18/5 = 56 The answer is (B).

question: Find 94 97
Options:
(A) 93/198
(B) 93/12
(C) 93/18
(D) 93/10
(E) 93/11
answer: Stream of consciousness: Here both numbers are less than 100. So they are deficient of - 6 and - 3 compared with 100. So The answer is (C).

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: Stream of consciousness: 6a2 = 6 * 9a * 9a = 243a2 The answer is (D).

question: If a train, travelling at a speed of 90 kmph, crosses a pole in 5 sec, then the length of train is?
Options:
(A) 125 m
(B) 104 m
(C) 140 m
(D) 152 m
(E) 150 m
answer: Stream of consciousness: D = 90 * 5/18 * 5 = 125 m The answer is (A).

q: A train 350 m long, running with a speed of 63 km/hr will pass a tree in?
Options:
(A) 22 sec
(B) 16 sec
(C) 17 sec
(D) 88 sec
(E) 20 sec
a: Stream of consciousness: Speed = 63 * 5/18 = 35/2 m/sec
Time taken = 350 * 2/35 = 20 sec The answer is (E).

q: The average mark obtained by 22 candidates in an examination is 46. The average of the first ten is 55 while the last eleven is 40 .The marks obtained by the 11th candidate is ?
Options:
(A) 22
(B) 0
(C) 19
(D) 18
(E) 16
a:
Stream of consciousness: It is clear that 22 x 46 = 10 x 55 + K + 11 x 40 K = 22 The answer is (A).