Reasoning: 10 m/s = 10 * 18/5 kmph
3 hours 45 minutes = 3 3/4 hours = 15/4 hours
Distance = speed * time = 10 * 18/5 * 15/4 km = 135 km.
Ans: (D)
Question: If a man can cover 10 metres in one second, how many kilometres can he cover in 3 hours 45 minutes?
Options:
(A) 288
(B) 162
(C) 145
(D) 135
(E) 130
Rationale: Work done by X in 1 day = 1/24
Work done by Y in 1 day = 1/16
Work done by Y in 10 days = 10/16 = 5/8
Remaining work = 1 5/8 = 3/8
Number of days in which X can finish the remaining work = (3/8) / (1/24) = 9
The answer: (E)
Question: X can finish a work in 24 days. Y can finish the same work in 16 days. Yworked for 10 days and left the job. how many days does X alone need to finish the remaining work?
Options:
(A) 3
(B) 5
(C) 6
(D) 8
(E) 9
Reasoning: 1/18 + 1/30 = 8/90 = 4/45
45/4 = 11 *2 = 22 1/2 days
Ans: (B)
Question: A can do a job in 18 days and B can do it in 30 days. A and B working together will finish twice the amount of work in ------- days?
Options:
(A) 22 1/8
(B) 22 1/2
(C) 22 1/1
(D) 22 1/5
(E) 22 1/9
Rationale: 9 is square of 3 which is odd number where as all others are squares of even numbers.
The answer: (C)
Question: Find the odd man out
4, 9,16, 36, 64, 144
Options:
(A) 144
(B) 16
(C) 9
(D) 36
(E) 4
Reasoning: Option 'C'
The total number of arrangements is
6P6 = 6! = 720
Ans: (C)
Question: In how many different ways can the letters of the word "POLICE" be rearrangement?
Options:
(A) 710
(B) 725
(C) 720
(D) 770
(E) 722
Reasoning: Average = (76 + 65 + 82 + 67 + 85)/5 = 375/5 = 75.
Ans: (A)
Question: Dacid obtained 76, 65, 82, 67 and 85 marks (out of 100) in English, Mathematics, Physics, Chemistry and Biology. What are his average marks?
Options:
(A) 75
(B) 45
(C) 23
(D) 28
(E) 96