Aptitude - Area - Discussion
Discussion Forum : Area - General Questions (Q.No. 1)
1.
The ratio between the length and the breadth of a rectangular park is 3 : 2. If a man cycling along the boundary of the park at the speed of 12 km/hr completes one round in 8 minutes, then the area of the park (in sq. m) is:
Answer: Option
Explanation:
| Perimeter = Distance covered in 8 min. = |  |
12000 | x 8 |  m = 1600 m. |
| 60 |
Let length = 3x metres and breadth = 2x metres.
Then, 2(3x + 2x) = 1600 or x = 160.
Length = 480 m and Breadth = 320 m.
Area = (480 x 320) m2 = 153600 m2.
Discussion:
48 comments Page 2 of 5.
Riya said:
7 years ago
Even 1 hour is converted to minutes only not to seconds. Why?
If we are converting km to metres then hours and minutes should be converted to seconds only.
Right?
If we are converting km to metres then hours and minutes should be converted to seconds only.
Right?
(2)
Riya said:
7 years ago
Why 8 minutes not converted to seconds. If it is converted to seconds then we should use 480, but here they used 8 to multiply. Why?
Please anyone explain.
Please anyone explain.
(2)
Ekta said:
3 years ago
Distance = Speed * time.
To convert km/hr to m/sec, multiply 5/18.
So, Dist= 12* 5/18 * 8 * 60 ( since, 1 min = 60 sec so 8*60),
= 1600 m.
To convert km/hr to m/sec, multiply 5/18.
So, Dist= 12* 5/18 * 8 * 60 ( since, 1 min = 60 sec so 8*60),
= 1600 m.
(20)
Hema said:
1 decade ago
Sankar you are wrong, the formula for perimeter is 2(l+b) =1600.
Then subs the value for l and b which means 2 (3x+2x) =1600.
6x+4x=1600 then x=160.
Then subs the value for l and b which means 2 (3x+2x) =1600.
6x+4x=1600 then x=160.
Aniruddh said:
1 decade ago
@manjula: 12000 and 60 are, 12km/hour will be converted into metre...
1km=1000m hence 12km=120000m and hr is converted as sec.1hr is 60 sec
1km=1000m hence 12km=120000m and hr is converted as sec.1hr is 60 sec
Sankar said:
1 decade ago
You said perimeter is 2 (l*b) but in above step perimeter we found as 1600m.
How is it possible two perimeter with different ans?
How is it possible two perimeter with different ans?
Kritika said:
10 years ago
Perimeter of the park is actually the distance covered by the cyclist and hence we use the formula of distance, speed and time.
Krishnakumar said:
8 years ago
Perimeter of rectangle formula is 2(l+w).
l is lengtg
W is width
12km/ hr.
1km 1000m.
1 hr is 60 s.
So 12*1000/60 m/s.
l is lengtg
W is width
12km/ hr.
1km 1000m.
1 hr is 60 s.
So 12*1000/60 m/s.
Satish said:
9 years ago
Anyone, please answer me. If any solution for this question without using any formula, like "perimeter" we are using above.
Apurv said:
4 years ago
Why taking x in common both length and Breadth. Why can't be we take as length = x and breadth = y? Please anyone explain.
(7)
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