A train 600 meters long is running with a speed of 50 kmph. The time taken by it to cross a tunnel 170 meters long is?
Options:
(A) 287 sec
(B) 288 sec
(C) 55 sec
(D) 16 sec
(E) 17 sec

D = 600 + 170 = 770
S = 50 * 5/18 = 14 mps
T = 770/14 = 55 se So the answer is: (C).

Which of the following numbers is divisible by 11?
Options:
(A) 4424
(B) 2232
(C) 1522
(D) 8524
(E) 9515

9515. This is the only option with last two digits divisible by 11 So the answer is: (E).

The average of 11 results is 51, if the average of first six results is 49 and that of the last six is 52. Find the sixth result?
Options:
(A) A) 46
(B) B) 45
(C) C) 66
(D) D) 76
(E) E) 74

1 to 11 = 11 * 51 = 561
1 to 6 = 6 * 49 = 294
6 to 11 = 6 * 52 = 312
6th = 294 + 312 561 = 45 So the answer is: (B).

10, 14, 16, 18, 21, 24, 26
Options:
(A) 17
(B) 20
(C) 21
(D) 25
(E) 26
Each of the numbers except 21 is an even number So the answer is: (C).