Question

11. The area of a square park is 25 sq km. The time taken to complete a round of the field once, at a speed of
3 km/h, is
(a) 4 h 60 min
(b) 4 h 50 min
(c) 6 h 40 min
(d) 5 h 40 min
hironmhas two roads each 10 m wide running in the middle of which one is​

Answer 1

Answer:

c)6h40min

Step-by-step explanation:

Area of square = side × side= 25 sq. km.

Side = 5 km.

perimeter = 4 × 5 = 20 km.

Time taken to complete one round with speed 3 kmph,

= 203203

= 6.66 hours

= 6 hour 40 minutes

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Answer 2

The time taken to complete one round of field is 6 hrs 40 minutes. so option (c) is correct.

The area of a square park is 25 km². The time taken to complete a round of the field once, at a speed of 3 km/h is..

Area of square = (edge length)²

⇒ 25km² = (edge length)²

⇒5 km = edge length

hence , edge length = 5km

now perimeter of square park = 4 × edge length

= 4 × 5 km = 20 km

now time taken to complete a round of the square park = distance covered in a round/speed

= 20 km/(3 km/h)

= 20/3 hrs

= 6 hrs (2/3 × 60 minutes)

= 6 hrs 40 minutes

Therefore the time taken to complete one round of the field at a speed of 3 km/h is 6 hrs 40 minutes. hence option (c) is correct.