Rationale: S = (80 + 60)/2 = 70 kmph
The answer: (A)
Question: The speed of a car is 80 km in the first hour and 60 km in the second hour. What is the average speed of the car?
Options:
(A) 70 kmph
(B) 92 kmph
(C) 75 kmph
(D) 65 kmph
(E) 77 kmph
Reasoning: 1/2:1/3:1/4 = 6:4:3
Ram = 6/13 * 3250 = 1500
Shyam = 4/13 * 3250 = 1000
Mohan = 3/13 * 3250 = 750
Ans: (A)
Question: A, B, C and D enter into partnership. A subscribes 1/3 of the capital B 1/4, C 1/5 and D the rest. How much share did A get in a profit of Rs.2460?
Options:
(A) 750
(B) 277
(C) 262
(D) 231
(E) 123
Rationale: D = 100 + 245 = 345 m
S = 54* 5/18 = 15
T = 345 * 1/15 = 23 sec
The answer: (D)
Question: How long does a train 100 m long traveling at 54 kmph takes to cross a station of 250 m in length?
Options:
(A) 22 sec
(B) 20 sec
(C) 15 sec
(D) 23 sec
(E) 16 sec
Reasoning: Speed = 60 * 5/18 = 50/3 m/sec
Length of the train = speed * time = 50/3 * 21 = 350 m
Ans: (A)
Question: A train running at the speed of 60 km/hr crosses a pole in 21 sec. What is the length of the train?
Options:
(A) 350 m
(B) 490 m
(C) 115 m
(D) 210 m
(E) 150 m
Rationale: 17m - n = p
Add n to both sides:
17m = n + p
Add m to both sides:
18m = n + p + m
Now, divide both sides by 3
6m = (n + p + m)/3 = the average of n, p, and m
The answer: (C)
Question: If 17m n = p, then which of the following represents the average (arithmetic mean) of m, n, and p, in terms of m?
Options:
(A) 2m 1
(B) 4m
(C) 6m
(D) m/5
(E) 6m/5
Rationale: Number of times wheel moves in 1 hour = 20 * 60 = 1200
:. Distance moves = (1200*35) cms = 42000 cms
In metres = 420 metr
The answer: (E)
Question: A wheel rotates 20 times every minute and moves 35 cm during each rotation. How many metres does the wheel move in one hour?
Options:
(A) 6 metre
(B) 120 metre
(C) 220 metre
(D) 1200 metre
(E) 420 metre