Ques:- Two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by the slower train to cross the faster train in seconds is?
Recent Answer : Added by Admin On 2022-09-29 17:57:30:
Relative speed = 60 + 90 = 150 km/hr.
= 150 x 5/18 = 125/3 m/sec.
Distance covered = 1.10 + 0.9 = 2 km = 2000 m.
Required time = 2000 x 3/125 = 48 sec.
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Ques:- There are 20 poles with a constant distance between each pole A car takes 24 second to reach the 12th pole. How much will it take to reach the last pole
Recent Answer : Added by Admin On 2022-09-29 16:26:22:
Let the distance between each pole be x m. Then, distance up to 12th pole = 11x m
∴ Speed = 11x22m/s
∴ Time to cover total distance up to 20th pole
= 19x×2411x
= 41.45 s
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Ques:- 3 persons started placementpapers with a capital of Rs.3000 . B invest Rs.600 less than A, C invest Rs.300 less than B. Then what is the share amount of B in a profit of Rs.886 ?
Recent Answer : Added by Admin On 2020-05-17 12:04:24:
Rs.265.80
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Ques:- Two numbers are in the ratio 3:5. If 9 be subtracted from each, they are in the ratio of 9:17. The first number is:
Recent Answer : Added by DK BOSS On 2021-07-17 06:18:46:
The first number is 36
Step-by-step explanation:
let their common factor be ‘x’
hence,
the ratio be 3x/5x
hence, by condition;
(3x-9)/(5x-9)=9/17 ch upu
9(5x-9)=17(3x-9)
45x-81=51x-153
153-81=51x-45x
72=6x
x=72/6
x=12
the first number is 3x=3×12=36
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Ques:- Using the ciphers 1 up to 9, three numbers (of three ciphers each) can be formed, such that the second number is twice the first number, and the third number is three times the first number. Which are these three numbers?
Recent Answer : Added by Erick Mesquita On 2022-11-06 15:57:09:
The 3-digit number can be written as the sequence [n, 2n, 3n]
n = 1 → [1, 2, 3] → valid
n = 2 → [2, 4, 6] → valid
n = 3 → [3, 6, 9] → valid
n = 4 → [4, 8, 12] is not valid because this would lead to a 4-digit number
any value of n > 4 would also produce invalid answer
Answer: Three numbers: {123, 246, 369}
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Recent Answer : Added by Admin On 2020-05-17 12:04:35:
7000
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Ques:- Find the highest common factor of 36 and 84.
A. 4
B. 6
C. 8
D. 12
Recent Answer : Added by BISHWAS KUMAR On 2022-01-16 17:16:46:
=36*84/ lcm
= 36 * 84 / (12 * 3 * 7 )
HCF= 12
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A. Sunday
B. Tuesday
C. Thursday
D. Friday
Recent Answer : Added by Anand On 2022-05-17 09:08:12:
sunday
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A. 6
B. 12
C. 24
D. 120
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c
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A. 22
B. 24
C. 44
D. 48
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22
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Ques:- Find out the wrong number in the series:
125, 106, 88, 76, 65, 58, 53
A. 65
B. 76
C. 88
D. 106
Recent Answer : Added by Abhay singh On 2022-05-17 08:56:47:
88
Ques:- A husband and wife has a combined age of 91.the husband is now twice as old as his wife was when he was as old as she is now. How old are they?
Recent Answer : Added by Admin On 2020-05-17 12:04:21:
ans is C.
let H be present age of husaband.W be present age of wife.
H+W=91.
now let diff between their ages be x.that is H-W=x.
now when husband is W yaers old, his wife must be W-x years
old.and it is given that H=2(W-x). so 2W-H=2x. and H-
W=x.eliminating x we get 4W=3H. but H+W=91, so solving thse
two H=52 W=39.
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Recent Answer : Added by Faisal On 2021-03-03 17:05:04:
Mohammad Gauri
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Ques:- If y/x = 1/3 and x + 2y = 10, then x is
Recent Answer : Added by L.Lalitha priya On 2022-05-17 08:56:35:
Given y/x = 1/3, x+2y =10
3y=x
Then substitute x=3y in x+2y=10
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Relative speed = 60 + 90 = 150 km/hr.
= 150 x 5/18 = 125/3 m/sec.
Distance covered = 1.10 + 0.9 = 2 km = 2000 m.
Required time = 2000 x 3/125 = 48 sec.