Question

A rectangular park is 104 metres long and 56 metres wide. Anjali walks around it at the rate of 4km/h. What time will she take in making 5 rounds of the park??
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Answer 1

Step-by-step explanation:

Perimeter of Park=2(l+b)

2(104+56)=320.

So, for 5 rounds,

320*5=1600

That is 1.6km.

So,

S=D/T

So, 4=1.6/T

So, 4T=1.6

So, T=0.4

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Answer 2

Question :

A rectangular park is 104 metres long and 56 metres wide. Anjali walks around it at the rate of 4km/h. What time will she take in making 5 rounds of the park?

Answer :

$\sf\pink {Given :}$

• length of a rectangular park is 104 metres .

• breadth of a rectangular park is 56 metres .

• speed of Anjali is 4 km/h .

• Number of rounds to be covered is 5 .

$\sf\pink {To\:find :}$

• time required to cover 5 rounds at the speed of 4 km/h ?

Explanation :

First we need to find the perimeter of the rectangular field then we will get the distance covered by anjali in 1 round . Then multiply the distance covered in 1 round by number of rounds to be covered that is 5 . Then we can find the time by the formulae speed is equal distance divided by time .

Perimeter of the rectangular park = 2 × ( l + b )

$\\ \longrightarrow\sf { 2\times ( 104 + 56 )}$

$\\ \longrightarrow\sf { 2\times 160}$

$\\ \longrightarrow\sf { 320\:m}$

Distance covered in 5 rounds = perimeter × 5

$\\ \longrightarrow\sf { 320\times 5}$

$\\ \longrightarrow\sf {1600\:m}$

$\\ \sf\purple{ speed = \dfrac {distance}{time}}$

• speed is in km/h

• distance in km = 1.6 km

$\\ \longrightarrow\sf {4 = \dfrac {1.6}{time}}$

$\\ \longrightarrow\sf {4\times time = 1.6}$

$\\ \longrightarrow\sf {Time = \dfrac {1.6}{4}}$

$\\ \longrightarrow\sf {Time = 0.4\:hours}$