Question

The length and breadth of a playground are 80 m and 35 m respectively.
(a) Find the cost of fencing it at 24.50 per square metre.
(b)How long will a boy take to go three times round the field, if he walks at the rate of 11 mm second.​

Answer 1

Answer:

first we will multiply 80 in to 35 which is equal to 2800 and then it will multiply 24. 50 the cost will be rupees 68600

Step-by-step explanation:

please mark me brainliest and thank my answer and follow

Answer 2

Answer:

a) ₹5635

b) 62727.27 seconds

Step-by-step explanation:

Length of fence = perimeter of the playground.

Formula → 2(l+b)

Here, l = 80m and b = 35m

So, P = 2(80m + 35m)

⇒ P = 2(115m)

⇒ P = 2 × 115m

⇒ P = 230m

a) Cost of fencing 1m = ₹24.50

Cost of fencing 230m = ₹24.50 × 230 m = ₹5635

b) Distance to be covered by the boy = 230 m × 3 = 690m

If he walks 11mm of distance in 1 second.

Then, time taken to cover 690m distance:-

First make both the measure of units same.

1m = 1000mm

690 m = 690m × 1000mm = 690000mm

Formula → Time taken = $\frac{Distance}{Speed}$

Here, Time taken = $\frac{690000mm}{11mm}$

⇒ Time taken = 62727.27 seconds

Hope it will help you.