q: A Train requires 12 seconds to pass a pole while it requires 27 seconds to cross a stationary train which is 300 mtrs long. Find the speed of the train.
Options:
(A) 60 kmph
(B) 75 kmph
(C) 80 kmph
(D) 85 kmph
(E) 72 kmph
a: Stream of consciousness: In 12s the train crosses the pole and in 27 sec the train crosses one more stationary train
In 15 sec the train travels a distance of 300 mtrs
Speed = 300/15 = 20 m/s = 20 (3600/1000) = 20 * 18/5 = 72 kmph The answer is (E).

question: One copy machine can make 30 copies a minute, and a second copy machine makes 20 copies a minute. If the two copiers work together, how long would it take them to make 2,000 copies?
Options:
(A) 20 minutes
(B) 40 minutes
(C) 45 minutes
(D) 50 minutes
(E) 55 minutes
answer: Stream of consciousness: Total work done by both machines in a minute = 30 + 20 = 50 copies
Total number of copies required = 2000
Time = 2000/50 = 40 mins The answer is (B).

q: Anil can do a work in 15 days while Sunil can do it in 25 days. How long will they take if both work together?
Options:
(A) 9 3/8 days
(B) 4 2/8 days
(C) 17 9/8 days
(D) 12 7/8 days
(E) 16 9/8 days
a: Stream of consciousness: 1/15 + 1/25 = 8/75
75/8 = 9 3/8 days The answer is (A).

question: A train 124 m long running at 68 kmph crosses a platform in 19 sec. What is the length of the platform?
Options:
(A) 338
(B) 234
(C) 240
(D) 881
(E) 271
answer: Stream of consciousness: D = 68 * 5/18 = 19 = 358 124 = 234 The answer is (B).

q: Find the value of y from given equation: (12)^3 x 6^4 432 = y?
Options:
(A) 2568
(B) 3468
(C) 4500
(D) 4876
(E) 5184
a: Stream of consciousness: Given Exp. = (12)3 x 64 = (12)3 x 64 = (12)2 x 62 = (72)2 = 5184
432 12 x 62 The answer is (E).

q: A train 250 m long running at 72 kmph crosses a platform in 15 sec. What is the length of the platform?
Options:
(A) 50m
(B) 200m
(C) 250m
(D) 270m
(E) 300 m
a:
Stream of consciousness: D = 72 * 5/18 = 15 = 300 250 = 50m The answer is (A).