Rationale: S = 240/16 * 18/5 = 54 kmph
The answer: (C)
Question: A train 240 m in length crosses a telegraph post in 16 seconds. The speed of the train is?
Options:
(A) 22
(B) 71
(C) 54
(D) 77
(E) 99
Reasoning: The length of cloth painted by one woman in one day = 48 / 4 2 = 6 m
No. of days required to paint 36 m cloth by 6 women = 36/ 6 6 = 1 day.
Ans: (B)
Question: If 4 women can color 48 m long cloth in 2 days, then 6 women can color 36 m long cloth in
Options:
(A) 2 days
(B) 1 day
(C) 4 days
(D) 3 days
(E) 2 1/5 days
Rationale: 10 * 15 + 36 26 = 160/10 = 16
The answer: (C)
Question: The average of 10 numbers is calculated as 15. It is discovered later on that while calculating the average, one number namely 36 was wrongly read as 26. The correct average is?
Options:
(A) 22
(B) 88
(C) 16
(D) 83
(E) 82
Reasoning: 70 + 50 = 120 * 5/18 = 100/3 mps
D = 150 + 100 = 250 m
T = 250 * 3/100 = 15/2 = 7 1/2 sec
Ans: (D)
Question: Two trains are moving at 50 kmph and 70 kmph in opposite directions. Their lengths are 150 m and 100 m respectively. The time they will take to pass each other completely is?
Options:
(A) 7 1/7 sec
(B) 7 7/2 sec
(C) 7 1/8 sec
(D) 7 1/2 sec
(E) 7 3/2 sec
Rationale: 9 = (1*40*R)/100
R = 22 1/2 %
The answer: (D)
Question: If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest?
Options:
(A) 22 1/8 %
(B) 22 9/2 %
(C) 22 1/7 %
(D) 22 1/2 %
(E) 21 1/2 %
Rationale: Speed of the train, v = 40 km/hr = 40000/3600 m/s = 400/36 m/s
Time taken to cross, t = 18 s
Distance Covered, d = vt = (400/36) 18 = 200 m
Distance covered is equal to the length of the train = 200 m
The answer: (E)
Question: A train is running at a speed of 40 km/hr and it crosses a post in 18 seconds. What is the length of the train?
Options:
(A) 190 metres
(B) 160 metres
(C) 180 metres
(D) 120 metres
(E) 200 metres