Find the cost of
per metre.
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?
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Answer:
The man will take 24 minutes to make 5 rounds of the field if he walks with speed of 4 km/h.
Step-by-step explanation:
Perimeter of rectangle = 2(l + b)
=> 2(90 + 70)
=> 2(160) => 320 m
As the man man is making 5 rounds, he will cover 5*perimeter => 5*320 => 1600 m or 1.6 km.
Speed of the man = 4 km/h
We know that T = D/S
=> Time = 1.6 km/4 km/h
∴ Time = 0.4 hours or 24 mins (0.4*60 => 24).
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