A rectangular field is 90 m by70 m. A man walks round it at the rate of 4 km per hour. What time will he take in making 5 round?
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Explanation:
The perimeter of a shape is essentially its boundary.
Perimeter of a rectangle = 2 (l+b)
Perimeter = 2 (90 + 70)
Perimeter = 2 * 160
Perimeter of the field = 320m
Distance the man needs to cover will therefore be the distance he needs to cover for each round multiplied by the number of rounds he takes, in this case 320m * 5, equalling 1600.
The man walks at the speed of 4km/h or 4000m/hr.
Using the formula:
Speed = Distance / time (Distance by time)
We know that Time = Distance/ speed (Distance by speed)
D= 1600 & S=4000
D/S = 1600/4000
Time = 2/5 of one hour
Time = 2/5 * 60
Time = 24.
Answer:
He will take 24 minutes to go around the field 5 times
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