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 4 of 5.
Chandrika said:
1 decade ago
Why multipty 2(3x+2x)=1600?
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.
Tapas sethy said:
1 decade ago
How length equal to 480 and breadth equal to 320?
Sathis said:
1 decade ago
Hi ashok just explain briefly.
How to apply in s=d/t.
How to apply in s=d/t.
Kavitha said:
1 decade ago
It is in the ratio of 3:2 so 160 x 3=480 and 160 x 2=320.
Sandip mulmule said:
1 decade ago
means 3:2
(3*x)+(2*x)=1600
5(2x)=1600/5
2x=320
x=320/2
x=160
.: 3*160=480
.:2*160=320
(3*x)+(2*x)=1600
5(2x)=1600/5
2x=320
x=320/2
x=160
.: 3*160=480
.:2*160=320
Tejveer said:
1 decade ago
Why you multiply with 2 in 2(3x+2x) =1600 ?
ANJI said:
1 decade ago
How did you come to know thats it PERIMETER, please tell.
Ismail said:
1 decade ago
Speed of the cycling is 12 km/hr and we can finish 8 round at the level if speed but here given speed is km/hr.
So we change meter/minute 12* (1000/60) =200 then we find speed of cycling for one round at one minute.
So 200*8 =1600m is the perimeter of the park.
So we change meter/minute 12* (1000/60) =200 then we find speed of cycling for one round at one minute.
So 200*8 =1600m is the perimeter of the park.
Abi said:
1 decade ago
How length equal to 480 and breadth equal to 320?
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