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How long will a boy take to run around a square field of side 35m, if he runs at a speed of 9km/hr?
- a)56 sec
- b)57 sec
- c)58 sec
- d)59 sec
Correct answer is option 'A'. Can you explain this answer?
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How long will a boy take to run around a square field of side 35m, if ...
To find the time taken by the boy to run around a square field, we need to calculate the distance around the field and then divide it by the speed of the boy.
1. Calculating the distance around the field:
The perimeter of a square is given by the formula P = 4s, where P is the perimeter and s is the length of one side.
Given that the side of the square field is 35m, we can substitute this value into the formula to find the perimeter.
P = 4 * 35m
P = 140m
2. Converting the speed from km/hr to m/s:
The boy's speed is given as 9km/hr. To convert this to m/s, we need to divide by 3.6 since there are 1000 meters in a kilometer and 3600 seconds in an hour.
Speed in m/s = (9km/hr) / (3.6)
Speed in m/s = 2.5m/s (approx)
3. Calculating the time taken:
The time taken can be found by dividing the distance around the field by the speed of the boy.
Time taken = Distance / Speed
Time taken = 140m / 2.5m/s
Time taken = 56 seconds
Therefore, the correct answer is option 'A' - 56 seconds.
1. Calculating the distance around the field:
The perimeter of a square is given by the formula P = 4s, where P is the perimeter and s is the length of one side.
Given that the side of the square field is 35m, we can substitute this value into the formula to find the perimeter.
P = 4 * 35m
P = 140m
2. Converting the speed from km/hr to m/s:
The boy's speed is given as 9km/hr. To convert this to m/s, we need to divide by 3.6 since there are 1000 meters in a kilometer and 3600 seconds in an hour.
Speed in m/s = (9km/hr) / (3.6)
Speed in m/s = 2.5m/s (approx)
3. Calculating the time taken:
The time taken can be found by dividing the distance around the field by the speed of the boy.
Time taken = Distance / Speed
Time taken = 140m / 2.5m/s
Time taken = 56 seconds
Therefore, the correct answer is option 'A' - 56 seconds.
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How long will a boy take to run around a square field of side 35m, if he runs at a speed of 9km/hr?a)56 secb)57 secc)58 secd)59 secCorrect answer is option 'A'. Can you explain this answer?
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