Question

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

Answer 1

given:-

• A rectangular field is 90 m by 70 m

• A man walks around it at the rate of 4km per hour

Find:-

• What time will he take in making 5 rounds

solution:-

Dimensions of the rectangular field = 90m × 70m.

we know that,

the perimeter of the rectangule=2(l+b)

therefore perimeter = 2(90+70) = 320m

Total distance to cover = 320 × 5 m = 1600m

speed of the man =$\sf{\longrightarrow} \: \dfrac{4km}{hour}$

$\sf{\longrightarrow} \: \dfrac{4000m}{60mins}$

$\sf{\longrightarrow} \: \dfrac{200m}{3mins}$

Therefore time taken to cover 5 rounds

$\sf{\longrightarrow} \: \dfrac{distance}{speed}$

$\sf{\longrightarrow} \: \dfrac{1600}{200} \times 3$

$\sf{\longrightarrow} 24mins$

time taken to cover 5 rounds is 24mins

Answer 2

Answer:

answer 5 rounds in 24 mins

Step-by-step explanation:

as 90*70 multiply by the distance then divide the time  

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