Ques:- Distance between two poles is 50 meters. A train goes by 48 at a speed of kmph. In one minute how many poles will be crossed by the train ?
Recent Answer : Added by Admin On 2020-05-17 12:01:58:
16 poles per min
48kmph=48000 meters per hr
=800 meters per min
800/50=16 poles per min
Ques:- Suppose you already have job offer and giving to interview to other new company. What reasoning should be given if other company employer asks that about reasons to not accept that job offer. I mean why you will not accept that offer if we will offer you?
Ques:- A man rows to a place 48 km distant and come back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is:
Recent Answer : Added by shashank chourasiya On 2022-03-09 16:42:05:
Hint: Assume that the speed of the stream is x and the speed of the boat in still water is x. From the statement of the question form two equations in two variables x and y. This system is reducible to linear equations in two variables. Reduce the system to a system of linear equations in two variables by proper substitutions. Solve the system of equations using any one of the methods like Substitution method, elimination method, graphical method or using matrices. Hence find the value of x satisfying both the equation. The value of x will be the speed of the stream.
Complete step-by-step answer:
Let the speed of the stream be x, and the speed of the boat in still water be y.
We have the speed of the boat upstream = y-x.
Speed of the boat downstream = y+ x.
Now since it takes 14 hours to reach a place at a distance of 48 km and come back, we have the sum of the times taken to reach the place downstream and time taken to return back upstream is equal to 14.
Now, we know that time =Distance speed
Using, we get
Time taken to reach the place =48y+x and the time taken to return back =48y−x.
Hence, we have
48y+x+48y−x=14
Dividing both sides by 2, we get
24y+x+24y−x=7 —–(i)
Also, the time taken to cover 4km downstream is equal to the time taken to cover 3km upstream.
Hence, we have 4y+x=3y−x
Transposing the term on RHS to LHS, we get
4y+x−3y−x=0 ——– (ii)
Put 1y+x=t and 1y−x=u, we have
24t+24u=7 ——-(iii)4t−3u=0 ——–(iv)
Multiplying equation (iv) by 6 and subtracting from equation (iii), we get
24t−24t+24u+18u=7⇒42u=7
Dividing both sides by 42, we get
u=742=16
Substituting the value of u in equation (iv), we get
4t−3(16)=0⇒4t−12=0
Adding 12 on both sides, we get
4t=12
Dividing both sides by 4, we get
t=18
Reverting to original variables, we have
1y+x=18 and 1y−x=16
Taking reciprocals on both sides in both equations, we have
y+ x=8 ——- (v)y−x=6 ——–(vi)
Adding equation (v) and equation (vi), we get
2y=14
Dividing both sides by 2, we get
y=7.
Substituting the value of y in equation (v), we get
7+x=8
Subtracting 7 from both sides we get
x = 8-7 =1
Hence the speed of the stream is 1 km/hr.
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Ques:- The temperature at Kochi is given by the function: – t2/6+4t+12 where t is the elapsed time since noon. What is the percentage rise (or fall) in temperature between 3.00 PM and 6.00 PM?
Recent Answer : Added by Admin On 2020-05-17 12:04:28:
temp at 3.oo pm is = 22.5
temp at 6.oo pm is = 30
thus, percentage rise= 7.5/30 *100
=25%
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Ques:- A rectangular field has area equal to 150 sq m and perimeter 50 m. Its length and breadth must be?
Recent Answer : Added by polo On 2020-11-19 16:12:30:
b=15,l=10 or b=10,l=15
Ques:- All men are vertebrates. Some mammals are vertebrates. Which of the following conclusions drawn from the above statement is correct. 1. All men are mammals 2. All mammals are men 3. Some vertebrates are mammals. 4. None
Recent Answer : Added by Sujanya On 2022-03-18 09:18:24:
3
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Recent Answer : Added by Admin On 2020-05-17 12:03:21:
b)Brother or Sister
Because Bis related to either Brother or Sister.
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Recent Answer : Added by Rashid Ather Deshmukh On 2021-10-07 15:42:06:
12
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Ques:- How many seconds will a 500 meter long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train if the speed of the train is 63 km/hr?
Recent Answer : Added by 1122 On 2022-05-17 08:56:27:
16 poles per min
48kmph=48000 meters per hr
=800 meters per min
800/50=16 poles per min