Question

rectangular a rectangular field is 19 by 70 metre a man walks around it at the rate of 4 kilometre per hour what time will he take in making 5 rounds

Answer 1

Given :

• Dimensions of rectangular field = 19m by 70m
• Speed of man = 4km/h
• Total round covered by man = 5 round

To find :

Time taken by man

Formula used :

• Perimeter of rectangle = 2(length + breadth)
• Speed = Distance ÷ time

Solution :

First of we will find out the perimeter of rectangular field

➝ Perimeter of rectangular field = 2(19m + 70m)

➝ Perimeter of rectangular field = 2(89m)

➝ Perimeter of rectangular field = 178m

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Now we will find distance covered by man when he covered 5 rounds

➝ Distance covered by man when he covered 5 rounds = 5 × perimeter of rectangular field

➝ Distance covered by man when he covered 5 rounds = 5 × 178m

➝ Distance covered by man when he covered 5 rounds = 890m

➝ Distance covered by man when he covered 5 rounds = 0.89 km

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Now ,

Speed = Distance ÷ time

➝ Time taken = 0.89km ÷ 4km/h

➝ Time taken = 0.2225 hour

➝ Time taken = 0.2225 × 60 minutes

➝ Time taken = 13.35 minutes

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ANSWER :

Time taken = 0.2225 hours = 13.35 minutes