Question

The length and breadth of a playground are 63.5 m and 36.5 m, respectively. How long
will a man take to go round the playground thrice if he walks at the rate of 2 m/s? Also
find the cost of turfing it at 4 per square metre.​

Plz answer it

Answer 1

perimeter=2(l+b)

2(36.5+63.5)=200m

speed=distance/time

time=d/s

time=200/2

time=100 sec

area=l*b

63.5*36.5

2317.5

cost=2317.5*4=9271m2

Answer 2

QuestioN :

The length and breadth of a playground are 63.5 m and 36.5 m, respectively. How long will a man take to go round the playground thrice if he walks at the rate of 2 m/s? Also  find the cost of turfing it at 4 per square metre.​

GiveN :

• The length and breadth of a playground are 63.5 m and 36.5 m respectively.

To FiNd :

• How long  will a man take to go round the playground thrice if he walks at the rate of 2 m/s.

• Also find the cost of turfing it at 4 per square metre.​

ANswer :

∴ Cost of turfing = Rs. 9271

SolutioN :

Length of playground = 63.5 m

Breadth of playground = 36.5 m

∴ Perimeter of playground = 2(63.5 + 36.5)

⇒ Perimeter of playground = 2 × 100

⇒ Perimeter of playground = 200 m

∴ Distance covered by the man = 3 * 200

∴ Distance covered by man = 600 m

∴Speed of man = 2m/s

⇒ Speed = Distance/Time

⇒ 2 = 600/Time

⇒ 2 × Time = 600

⇒ Time = 600/2

⇒ Time = 300 s

∴ A man will take 300 s to go round the playground thrice.

Now,

⇒ Area of playground = Length × Breadth

⇒ Area of playground = 63.5 × 36.5

⇒ Area of playground = 2317.75 m²

∴Rate of turfing = Rs. 4/m²

⇒ Cost of turfing = Area × Rate

⇒ Cost of turfing = 2317.75 × 4

⇒ Cost of turfing = Rs. 9271

∴ Hence, The cost of turfing = Rs. 9271