# the area of a rectangular field is 3584m sq and its lenght is 64m. A boy runs around the field at the rate of 6 km/h. how long will he take to go 5 times around it?

Length of rectangular field = 64 m
Area of rectangular field = 3584 ${\mathrm{m}}^{2}$
So breadth of rectangular field = m
Then, Perimeter of rectangular field =
Now a boy is running 5 times around the field. So total distance covered by a boy = m
Speed = 6km/h = m/s
So time taken by boy to cover the total distance =
therefore time taken by boy is 720 seconds.

• 4

let the breadth be 'x'

leght = 64 m

area of rectangular field = l * b

3584 = 64 * x

3584/64 = x

56 m = x

breadth = 56 m

perimeter of the field = 2(l+b)

= 2(64+56)

= 2(120)

= 240 m

speed of the boy = 6km/h

time =distance/speed

= 240*5*60/6000

= 12 mins

the boy takes 12 mins to go 5 times around the field

• 12
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