Question

distance does he cover ?
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 ?
lo whose length is 70 cm and breadth is 30 cm​

Answer 1

{Here question is}

Question : A rectangular field is 90 m by 70 m. A man walks around it at the rate of 4 km/hr. What time will he take in making 5 rounds ?

Solution : Let, length of rectangular field be 90 m and breadth of rectangular field be 70 m.

Now,

⟹ Perimeter of rectangular field = 2 (length + breadth)

⟹ Perimeter of rectangular field = 2 (90 + 70)

⟹ Perimeter of rectangular field = 2 * 160

⟹ Perimeter of rectangular field = 320 m

∴ distance covered by man is 320 m.

Now, we need to convert 4 km/hr into m/s.

⟹ 4 km/hr = (4000/3600) m/s

⟹ 4 km/hr = (40/36) m/s

⟹ 4 km/hr = (10/9) m/s

Now,

⟹ speed = distance/time

⟹ 10/9 = 320/time

⟹ 10 = 320/time * 9

⟹ 10 = 2880/time

⟹ time = 2880/10

⟹ time = 288 sec

Man take 288 sec to complete one round of the rectangular field.

Time taken by man to complete 5 round of field :

⟹ time = 5 * 288

⟹ time = 1440 sec

Answer : Hence man take 1440 sec to complete 5 round of the rectangular field.

{More info :

⟹ 1440 sec = (1440/3600) hour

⟹ 1440 sec = 0.4 hour}

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