Question

Solve is f ast

Please fast!​

Answer 1

Given,

length = 80cm

Breadth = 35cm

$\implies$ ⟹ Perimeter of Rectangle = 2(Length + breadth}

$\implies$⟹ 2(80+35)

$\implies$⟹ 2(115)m

$\implies$⟹ = 230m

$\implies$⟹ Area of Rectangular field= lenght × breadth

$\implies$⟹ = 80×35

$\implies$⟹ = 2800 m²

Cost of levelling = Rs. 4.5/m²

$\implies$⟹ = 4.5×2800

$\implies$⟹ = 12,600 rs.

The boy walks at the rate of 1.5m /sec.

The boy will walk across the perimeter of the field.

$\implies$⟹ (3 rounds) 3× 230

$\implies$⟹ = 690 m

Total Distance = 690 m

$\implies$⟹ Speed = Distance /time

$\implies$⟹ Time = 690/1.5

$\implies$⟹ = 460 seconds

$\implies$⟹ = 7.6Minutes

$\bf{\textcolor{blue}{\colorbox{lime}{Answer : [1] 12,600 Rs.}}}$


$\bf{\textcolor{blue}{\colorbox{lime}{Answer : [2] Time taken = 460sec ~7.6 minutes.}}}$

Answer 2

Length of playground = 80 m.

Breadth of playground = 35 m.

Area of playground = length×breadth

=80×35

= 2800 m^2

Cost of levelling 1 m^2 = ₹4.50

Cost of levelling 2800 m^2 = ₹4.50×2800

$\bf{= Rs \:12600 }$

__________________________

2) Perimeter of playground = 2(l+b)

= 2(80+35)

=2×115

=230 m

Speed of boy = 1.5 m/sec

Distance covered in 1 round = perimeter of playground

=230 m

Distance covered in 3 rounds = 3×230

= 690 m

Time taken = distance/speed

=690/1.5

$\bf{=460\: sec }$