Ques:- A train 240 m long passed a pole in 24 seconds. How long will it take to pass a platform 650 m long?
A. 65 sec
B. 79 sec
C. 89 sec
D. 99 sec
Recent Answer : Added by GAYATHRI On 2023-03-14 17:27:09:
240-24
650-?
?=24*650/240
65SEC
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Ques:- There is a 50m long army platoon marching ahead. The last person in the platoon wants to give a letter to the first person leading the platoon. So while the platoon is marching he runs ahead, reaches the first person and hands over the letter to him and without stopping he runs and comes back to his original position. In the mean time the whole platoon has moved ahead by 50m. The question is how much distance did the last person cover in that time. Assuming that he ran the whole distance with uniform speed.
Recent Answer : Added by Admin On 2020-05-17 12:00:37:
The last person covered 120.71 meters.
It is given that the platoon and the last person moved with
uniform speed. Also, they both moved for the identical
amount of time. Hence, the ratio of the distance they
covered – while person moving forward and backword – are
equal.
Let’s assume that when the last person reached the first
person, the platoon moved X meters forward.
Thus, while moving forward the last person moved (50+X)
meters whereas the platoon moved X meters.
Similarly, while moving back the last person moved [50-(50-
X)] X meters whereas the platoon moved (50-X) meters.
Now, as the ratios are equal,
(50+X)/X = X/(50-X)
(50+X)*(50-X) = X*X
Solving, X=35.355 meters
Thus, total distance covered by the last person
= (50+X) + X
= 2*X + 50
= 2*(35.355) + 50
= 120.71 meters
Note that at first glance, one might think that the total
distance covered by the last person is 100 meters, as he
ran the total lenght of the platoon (50 meters) twice.
TRUE, but that’s the relative distance covered by the last
person i.e. assuming that the platoon is stationary.
Ques:- There is a pyramid with 1 cup at level , 2 at level 2 , 3 at level 3 and so on.. It looks something like this 1 2 3 …
Ques:- What is the 12th term of the series 2, 5, 8, …. ?
Recent Answer : Added by Mukesh On 2022-08-14 16:31:48:
a = 2
d = 5 – 2 = 3
Then 12th term is :
This in arithmetic progression
L = a + (12 – 1) d
L = 2 + 11 * 3
L = 2 + 33 = 35
Ques:- If an insurance company pays $5000 for complete loss, $1500 in case of a loss of $2000 and more and nothing in case the loss is less that $2000. It obviously pays nothing in case of no loss. If the probability of the first 3 events are 0.02,0.10 and 0.3 , find what should the company charge in order to make a profit of $50 from each customer ?
Ques:- A ship is 180 miles away from the shore. A plane is traveling at 10 times speed of the ship. How long from the shore will they meet?
Ques:- Do you feel you work more effectively on a one to one basis or in a group situation?
Recent Answer : Added by RITESH KATARWAR On 2021-11-18 17:15:58:
group wise work is use full and effectively
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Ques:- What is the smallest number by which 2880 must be divided in order to make it into a perfect square ?(a) 3(b) 4(c) 5 (d) 6
Recent Answer : Added by Aanchal Thakur On 2022-03-09 16:41:11:
5
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Ques:- At what rate percent on simple interest will a sum of money double itself in 30 years?
Recent Answer : Added by Amudha A On 2021-09-09 07:24:42:
A=P+SI——(1)
sum of money after 30 years = Double the money
A=2P———-(2)
Equate 1 and 2
P+SI=2P
SI=2P-P
SI=P————-(3)
WKT, SI= PTR/100
Equate 3 and SI
P=PTR/100
P=P*30*R/100
R=P*100/P*30
R=100/30 or 10/3 or 3(1/3) %
Ques:- If there are 1024*1280 pixels on a screen and each pixel can have around 16 million colors. Find the memory required for this?
Ques:- A property decreases in value every year at the rate of 6 1/4% of its value at the beginning of the year its value at the end of 3 years was Rs.21093. Find its value at the beginning of the first year?
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Ques:- A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. What is the length of the train?
Recent Answer : Added by megha On 2022-11-24 16:55:33:
150m
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Ques:- The difference between the compound interest compounded annually and simple interest for 2 years at 20% per annum is Rs.144. Find the principal?
Recent Answer : Added by Atif On 2022-12-05 16:13:26:
3600
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Ques:- A person is prisoned for 60 days . In that 60 days he earns rs.170.If he works he will get payed Rs.7 per day. If he doesn’t work Rs.3 he should pay to that prison.Find out how many days he worked.
Recent Answer : Added by ANCHAL PHUTELA On 2021-07-21 15:24:44:
He will work for 35 days in 60 days to earn Rs.170 as per the condition
ANSWER is ==> 1
1st step : 0.5
2nd step : 0.5+0.05 = 0.55
3rd step : 0.55+0.10 = 0.65
4th step : 0.65+0.15 = 0.8
5th step : 0.80+0.20 = 1.00