Question

A person walks at the rate of 4km/hr. How long will he take to go round a square park 5 times,whose area is 2500m^2?​

Answer 1

Answer:

15 minutes

Step-by-step explanation:

Area of Square Park = 2500 sq m.

Side of the park = sq rt of 2500 = 50 m.

Perimeter of the square = 4*50 = 200 m.

In round he has to travel 200 m.

So, in 5 round, he needs 5 * 200 = 1000 m to travel.

He needs 15 minutes to go 5 round of the park.

Hope It Helps!

Answer 2

$area \: of \: square \: = 2500 \: {m}^{2} \\ {(side)}^{2} = {(50 \: m)}^{2} \\ side \: = \sqrt{ {(50 \: m \: )}^{2} } \\ =50 \: m \\ distance \: travelled \: in \: completing \: 1 \: round \: =4 \times 50 \: m \: = 200 \: m \\ distance \: travelled \: in \: completing \: 5 \: rounds \: =5 \times 200 \: m \: =1000 \: m \: = 1 \: km \\ speed= 4 \: \frac{km}{hr.} \\ time \: taken \: = \: \frac{distance \: travelled}{speed} \\ = \frac{1 \: km}{4 \: \frac{km}{hr.} } \\ = \frac{1}{4} \frac{km}{km} \times hr. \\ = \frac{1}{4} hr. \\ 1 \: hr. \: =60 \: mins. \\ \frac{1}{4} hr. = \frac{1}{4} \times 60 \: mins. \\ =15 \: mins.$

Hence, time taken by the person = 15 minutes

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Hope it helps to you !!