Question

The length and breadth of a playground are 80 m and 35 m respectively find the cost of levelling it at rupees 4.50 per square metrehow long will a boy take to go three times round the field it if he walks at rate of 1.5 seconds

Answer 1

$\large \tt AHOY!! \:$

given :-

length of the play ground = 80m

breadth of the play ground = 35m

area of the playground = Length × breadth

= 90 × 35

= 3150m²

now it's given that the cost of levelling is 4.50 per m².

therefore total cost of levelling = 4.50 × 3150
= 14175 rupees.

second part..

we have to find out the time taken by the boy if he goes around the playground three times @ 1.5 second per meter.

first of all, we have to find it's perimeter


perimeter of the playground = 2 ( l + b )

= 2 ( 80 + 35 )

= 2 × 115

= 230m

therefore total distance travelled by the boy = 230 × 3 ( since he goes around the playground 3 times )

= 690m

total time Taken = 690 × 1.5

= 1035 seconds

in minutes = 1035/60 ( one minute = 60 seconds )

= 17.25 minutes

$\large \tt HOPE \: THIS \: HELPS!!$

Answer 2

Rs 12600

Answer:

Firstly , Area of the playground = Length × breath

80m × 35m =Rs 2800

2800 × 4.50 =Rs 12600

This is the solution of first part