Question

the perimeter of a rectangular field is 4/5.if the length of field is thrice its width then find area













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Answer 1

The length of a rectangular field is twice its breadth. A girl jogged around it 4 times and covered a distance of 4.5 km. What is the length of the field?

The distance cover in 4 laps is 4.5 km, So one lap is 4.5/4 = 1.125 km.

Let the breadth of the field be B so the length will be L or 2B.

The perimeter of the field is 2L+2B or 4B+2B = 6B = 1.125, so B = 1.125/6 = 0.1875 km and the length is 2*0.1875 = 0.375 km.

Check: Perimeter = 2*0.375 + 2*0.1875 = 1.125 km and 4 laps covers 4*1.125 = 4.5 km. Correct.

The field is 375 m long.

Answer 2

Answer:

Step-by-step explanation:

perimeter=4/5

length= 3b here b means breadth.

perimeter = 2(l+b) =4/5.

2(3b+b)=4/5

2(4b)=4/5

4b=4/5*2

4b=8/5

b=8/5*4

b=40/5

b=8

lenghth = 3b =3*8=24.