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 5 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)
Hema M said:
6 years ago
Length =3x and Breadth = 2x.
Distance = 12000/60 = 200 * 8 = 1600,
3x+2x=1600,
5x^2=1600,
x^2=1600/5=320,
x=160.
3x = 3 * 160 = 480 and 2x = 2 * 160 = 320.
Area = (480*320)m^2.
= 153600 m^2.
Distance = 12000/60 = 200 * 8 = 1600,
3x+2x=1600,
5x^2=1600,
x^2=1600/5=320,
x=160.
3x = 3 * 160 = 480 and 2x = 2 * 160 = 320.
Area = (480*320)m^2.
= 153600 m^2.
(6)
Hema M said:
6 years ago
1 km = 1000 m.
Then, distance=speed*time,
Here speed is 12 km/hr.
12 km is converted to 12*1000 m.
Then, 8 mins is converted to 8/60 sec.
So, 12*1000 * 8/60 = 1600 m.
Then, distance=speed*time,
Here speed is 12 km/hr.
12 km is converted to 12*1000 m.
Then, 8 mins is converted to 8/60 sec.
So, 12*1000 * 8/60 = 1600 m.
(3)
Hema M said:
6 years ago
1 km /hr = 1000/3600 m/s,
= 5/18 m/s.
= 5/18 m/s.
(6)
Subrata Mondal said:
4 years ago
Thank you so much for this explanation and this season is very helpful.
(4)
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)
Merv zoro said:
3 years ago
l/b = 3/2.
s = d/t.
12 x 8/60 = 1.6km,
2(l+b) = 1.6
2(3b/2+b) = 16,
2(5b/2) = 1.6,
b = 1.6/5.
b = 0.32
l = 0.48.
lxb = 0.153km2.
a = 0.1536x10^(6),
a = 153600 m2.
s = d/t.
12 x 8/60 = 1.6km,
2(l+b) = 1.6
2(3b/2+b) = 16,
2(5b/2) = 1.6,
b = 1.6/5.
b = 0.32
l = 0.48.
lxb = 0.153km2.
a = 0.1536x10^(6),
a = 153600 m2.
(11)
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)
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