Question

the lenght of a rectangular field is twice its breadhth. A girl jogged around it 4 times and covered a distance of 4.5 km what is the length of the field?​

Answer 1

Let the length of field be '2x'. So the breadth will be x.

Perimeter of the ground(distance covered in 1 round)= 2(l+b)

=2(2x+x)

=6x

Distance covered in 4 rounds= 4*(6x)

=24x

since it is given 4.5 km or 4500m

24x=4500 m

x=4500/24

x=187.5 m

Since the length=2x

l= 2*187.5m

l=375 m or 0.375 km

May it helps u

thankss

Answer 2

Answer:

In completing one round of the field distance covered is equal to the perimeter of the field.

∴ Distance covered in 5 rounds = 5 x Perimeter

= 5 x 2 ( l + w )

= 10 x ( l + w)

= 10 x ( 2w + w ) [ length = l = 2w ]

= 10 x 3w

= 30 w

But, the total distance covered is given = 3 km = 3000 m.

∴ 30 x w = 3000

⇒ w = 3000 / 30

⇒ w = 100 m

⇒ Length = 2 w = 2 x 100 = 200 m

$hope \: its \: help \: u$