question:In what time will a railway train 60 m long moving at the rate of 36 kmph pass a telegraph post on its way?
Options:
(A) 10 sec
(B) 8 sec
(C) 5 sec
(D) 6 sec
(E) 11 sec
answer:(D)
Stream of consciousness:T = 60/36 * 18/5 = 6 sec

question:If the average (arithmetic mean) of the four numbers K, 2K + 3, 3K 4 and 5K + 1 is 63, what is the value of K?
Options:
(A) 22 10/11
(B) 15 3/4
(C) 22
(D) 23
(E) 25 3/10
answer:(A)
Stream of consciousness:K + 2K +3 + 3K - 4 + 5K +1 = 11K
(11K -1)/4 = 63
11K = 63 * 4 = 252
K = 252 / 11 = 22 10/11

question:A man rows his boat 80 km downstream and 38 km upstream, taking 3 hours each time. Find the speed of the stream?
Options:
(A) 6
(B) 9
(C) 7
(D) 8
(E) 2
answer:
(B)
Stream of consciousness:Speed downstream = d/t = 80/(3) = 27 kmph
Speed upstream = d/t = 38/(3) = 9 kmph
The speed of the stream = (27 - 9)/2 = 9 kmph