Question

A rectangular field is 72 m by 58 m. Keya walks around it at the rate of 3 km per hour
How long will she take to make 3 rounds?
Find the cost of fencing a square park of side 17 m at the rate of 27.50 per metre
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Answer 1

Question 1:

A rectangular field is 72 m by 58 m. Keya walks around it at the rate of 3 km per hour.How long will she take to make 3 rounds?

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Answer:-

Given:-

• Length = 72m
• Breadth = 58m
• Speed = 3km/ hour

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Need to find:-

• Time taken to cover 3 rounds =?

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Solution:-

Perimeter of the field = 2 × (Length + Breadth)

→ Perimeter = 2 × (72 + 58) m

→ Perimeter = 2 × 130 m

→ Perimeter = 260 mm

The distance she'll cover in 3 rounds = 3 × 260km

→ Distance = 780 m

→ Distance = 0.78 km

Time taken to cover that distance = 0.78 ÷ 3 hours

→ Time taken = 0.26 hours

→ $\red{\boxed {\bold{\large{Time \:taken = 15.6 minutes}}}}$

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Question 2:

Find the cost of fencing a square park of side 17 m at the rate of 27.50 per metre.

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Answer:-

Given:-

• Side = 17m
• Rate = 27.5 /m

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Need to find:-

• Cost =?

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Solution:-

Perimeter of the square filed = 17 × 4m

→ Perimeter = 68 m

The cost= 68 × 27.5 rupees

→ $\red{\boxed{\bold{\large{Cost = 1870 Rupees}}}}$

Answer 2

Question 1 :

• A rectangular field is 72 m by 58 m. Keya walks around it at the rate of 3 km per hour. How long will she take to 3 rounds?

A N S W E R :

• 0.26 hours (15.6 minutes) she will take to make 3 rounds.

Given :

• Length = 72 m

• Breadth = 58 m

• Speed = 3 km/h

To find :

• Find how long she take to make 3 rounds ?

Solution :

As we know that,

Formula Used :

★ Perimeter Of Rectangle = 2 × (Length + Breadth)

=> Perimeter Of Rectangle = 2 × (72 + 58)

=> Perimeter Of Rectangle = 2 × 130

=> Perimeter Of Rectangle = 260

=> Perimeter Of Rectangle = 260 m

Again, As we know that,

Formula Used :

★ Speed = Distance/Time

Here,

=> Speed = 3 km

=> Distance = 260 × 3 = 780 m = 0.78 km

Again, Also, As we know that,

Formula Used :

★ Time = Distance/Speed

=> Time = 0.78/3

=> Time = 0.26

=> Time = 0.26 hours

Hence,

• 0.26 hours (15.6 minutes) she will take to make 3 rounds.

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Question 2 :

• Find the cost of fencing a square park of side 17 m at the rate of 27.50 per metre.

A N S W E R :

• The cost of fencing is Rs. 1870.

Given :

• Side = 17 m

• Rate = 27.50 per metre

To find :

• Find the fencing cost ?

Solution :

• Fencing is to be done on the edges of the park

Therefore,

• We have to calculate the perimeter of four walls i.e.,

=> Perimeter of park = 17 × 4

=> Perimeter of park = 68 m

Now, We have,

• Fencing one metre is 27.5

Then,

• The cost of fencing 68 metre would be

=> Perimeter of park = 68 × 27.5

=> Perimeter of park = Rs. 1870

Hence,

• The cost of fencing is Rs. 1870.