question:The speed of a boat in still water is 90kmph and the speed of the current is 20kmph. Find the speed downstream and upstream?
Options:
(A) 40, 68 kmph
(B) 110, 70 kmph
(C) 90, 60 kmph
(D) 40, 60 kmph
(E) 20, 60 kmph
answer:(B)
Stream of consciousness:Speed downstream = 90 + 20 = 110 kmph
Speed upstream = 90 - 20 = 70 kmph

question:A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 240 m long?
Options:
(A) 40 sec
(B) 42 sec
(C) 45 sec
(D) 48 sec
(E) 50 sec
answer:(D)
Stream of consciousness:Speed = 45 * 5/18 = 25/2 m/sec
Total distance covered = 360 + 240 = 600 m
Required time = 600 * 2/25 = 48 sec

question:The average age of 8 men increases by 2 years when two women are included in place of two men of ages 20 and 24 years. Find the average age of the women?
Options:
(A) 11
(B) 12
(C) 30
(D) 98
(E) 15
answer:
(C)
Stream of consciousness:20 + 24 + 8 * 2 = 60/2 = 30