Question

A rectangular field is 90 m by 70 m. A man walks round it at the rate of 4 km per hour. What time will he take in making 5 rounds?​

Answer 1

Information provided with us:

• ➪ A rectangular field is 90 m by 70 m.

• ➪ A man walks round it at the rate of 4 km per hour.

What we have to calculate༄

➪ The required time will he take in making 5 rounds

✰Note :

➪ Distanced covered in one round = Perimeter of the Field

✰Now ༄

$\clubsuit \: \rm \: Perimeter \: of \: the \: Field$

$\longrightarrow\bigstar \: \: \sf\boxed{\bold{\orange{2 \times (90 + 70) \: m}}}\: \: \: \bigstar$

$\longrightarrow\bigstar \: \: \sf\boxed{\bold{\green{2 \times 160 \: m}}}\: \: \: \bigstar$

$\implies\bigstar \: \: \sf\boxed{\bold{\gray{320 \:m}}}\: \: \: \bigstar$

✰Now ༄

➡ Distance covered in 5 rounds

$\longrightarrow\bigstar \: \: \sf\boxed{\bold{\red{Perimeter \: of \: field \times Numbers \: of \: round }}}\: \: \: \bigstar$

$\longrightarrow\bigstar \: \: \sf\boxed{\bold{\orange{320 \: m \times 5}}}\: \: \: \bigstar$

$\longrightarrow\bigstar \: \: \sf\boxed{\bold{\green{1600 \: m}}}\: \: \: \bigstar$

✰We know that ༄

$\clubsuit \: \rm \: 1 \: km \: = 1000 \: m$

✰Now ༄

• ➡ Convert 1600 m into km by dividing it by 1000

✰So༄

$\rm \implies \: 1600 \div 1000$

$\rm \implies \: 1.6 \: k.m$

✰Now ༄

➡ Time Taken

$\longrightarrow\bigstar \: \: \sf\boxed{\bold{\red{ \dfrac{1.6}{4} }}}\: \: \: \bigstar$

$\longrightarrow\bigstar \: \: \sf\boxed{\bold{\purple{0.4 \: hours }}}\: \: \: \bigstar$

✰We also know that ༄

$\clubsuit \: \rm \: 1\: hour \: </p><p>= 60 \: minutes$

✰Now ༄

➡ Convert 0.4 hours into minutes by multiplying it by 60

✰So༄

$\rm \implies \: 0.4\times 60$

$\bf \implies \: 24 \: minutes$

✰Henceforth ༄

$\rm \therefore \: Thus \: required\: time\: will \:he \:take \: in \: making \: 5 \: rounds \: is \: \bf \underline{0.4 \: hours \:or \: 24 \: minutes}$

Answer 2

Answer:

Thanks for your question...

Your required answer :

Given :

• Length = 90 m
• Breadth = 70 m

• Round = At rate of 4 km / hr
• Time taking in 5 rounds = ?

To find the rounds we have to find the perimeter of rectangle So :

• Perimeter of rectangle = 2 ( L + B )
• = 2 ( 90 + 70 )
• = 2 ( 160 )
• = 320 m

Now distance covered by man in 5 rounds :

• 5 × ( 320 )
• 1600 m

Now, converting 1600 m into km :

→ For changing into metre we have to divide 1600 by 1000 because :

• 1 m = 1000 km

So :

• $\frac{1600}{1000} \\ \\ 1.6 \: km$

Now time taken in 4 hours :

• $\frac{1.6}{4}$
• 0.4 hours

We have to change hour into minutes So :

• 1 hours = 60 minutes

• 0.4 × 60
• 24 minutes

Therefore , a man require 24 km for making 5 rounds of a rectangular field .

Brainliest Please