question: A train of 25 carriages, each of 60 meters length, when an engine also of 60 meters length is running at a speed of 60 kmph. In what time will the train cross a bridge 1.5 km long?
Options:
(A) 2 mins 14 sec
(B) 2 mins 34 sec
(C) 180 sec
(D) 4 mins 54 sec
(E) 2 mins 44 sec
answer: Stream of consciousness: D = 25 * 60 + 1500 = 3000 m
T = 3000/60 * 18/5 = 180 se The answer is (C).


q: Which one of the following is a prime number?
Options:
(A) 45
(B) 90
(C) 81
(D) 29
(E) 91
a: Stream of consciousness: 73 is divisible by 1 and itself So, it is a prime number. The answer is (D).


question: A no.when divided by 221 gives a remainder 43, what remainder will beobtained by dividing the same number19?
Options:
(A) 3
(B) 6
(C) 9
(D) 11
(E) 15
answer: Stream of consciousness: 221 + 43 = 264/17 = 9 (Remainder) The answer is (C).


q: A 200 meter long train crosses a man standing on the platform in 9 sec. What is the speed of the train?
Options:
(A) 228
(B) 108
(C) 1266
(D) 188
(E) 80
a: Stream of consciousness: S = 200/9 * 18/5 = 80 kmph The answer is (E).


question: Maximum no of unsuccessful attempts, a thief can do in order to break a number locking system of 4 digits.
Options:
(A) 9988
(B) 9999
(C) 9799
(D) 9685
(E) 6545
answer: Stream of consciousness: From 0 to 9999 there are 10000 four digit numbers
So maximum number of unsuccessful attempts = 10000 - 1 = 9999 The answer is (B).


question: Eight friends go to watch a movie but only 5 tickets were available. In how many different ways can 5 people sit and watch the movie?
Options:
(A) 8C5
(B) 8*7*6*5*4
(C) 5!
(D) 8!/5!
(E) 8*5
answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Stream of consciousness: Choosing 5 out of 8, when order matters P58, or choosing 5 out of 8, without order and then arranging: C58∗5! The answer is (B).