question: A 600 meter long train crosses a signal post in 40 seconds. How long will it take to cross a 3 kilometer long bridge, at the same speed?
Options:
(A) 4 min
(B) 6 min
(C) 8 min
(D) 2 min
(E) 9 min
answer: Stream of consciousness: S = 600/40 = 15 mps
S = 3600/15 = 240 sec = 4 min The answer is (A).


q: The average of first six prime numbers greater than 3 is?
Options:
(A) 16
(B) 10
(C) 12
(D) 19
(E) 17.8
a: Stream of consciousness: 5 + 7 +11 + 13 + 17 + 19 = 72/6 = 12 The answer is (C).


question: Look at this series: 53, 53, 39, 39, 25, 25, ... What number should come next?
Options:
(A) A) 12
(B) B) 11
(C) C) 27
(D) D) 53
(E) E) 86
answer: Stream of consciousness: In this series, each number is repeated, then 14 is subtracted to arrive at the next number. The answer is (B).


q: A shopkeeper gave an additional 20 per cent concession on the reduced price after giving 30 per cent standard concession on an article. If Arun bought that article for 1,120, what was the original price?
Options:
(A) 3,000
(B) 4,000
(C) 2,400
(D) 2,000
(E) None of these
a: Stream of consciousness: Original price = 1120 × 100⁄70 × 100⁄80 = 2000 The answer is (D).


question: X can finish a work in 18 days. Y can finish the same work in 15 days. Yworked for 10 days and left the job. how many days does X alone need to finish the remaining work?
Options:
(A) 3
(B) 5
(C) 6
(D) 7
(E) 9
answer: Stream of consciousness: Work done by X in 1 day = 1/18
Work done by Y in 1 day = 1/15
Work done by Y in 10 days = 10/15 = 2/3
Remaining work = 1 – 2/3 = 1/3
Number of days in which X can finish the remaining work = (1/3) / (1/18) = 6 The answer is (C).


question: A train 90 meters long is running with a speed of 54 kmph. The time taken by it to cross a tunnel 120 meters long is?
Options:
(A) 29
(B) 18
(C) 14
(D) 99
(E) 13
answer:
Stream of consciousness: D = 90 + 120 = 210
S = 54 * 5/18 = 15 mps
T = 210/15 = 14 se The answer is (C).