The Boundary Of A Square Field Of Area

A motorist travels along the boundary of a square field of area 1476225 m square , at 36 km/hr. he returns to starting point in

  1. 8 min, 8 sec
  2. 6 min, 8 sec
  3. 8 min, 6 sec
  4. 6 min, 6 sec
Anurag Mishra Professor Asked on 19th July 2015 in Maths.
Add Comment
1 Answer(s)

Answer: (3) 8 min 6 sec
Explanation:-
The area of square field = 1476225 m2
Formula-
The area of square field = Side x Side
Then, Side of square field = (1476225)1/2
= 1215 m
Formula-
The perimeter of square field = 4 x side
then, the perimeter of field = 4 x 1215
= 4860 m
4860 m = 4860/1000 km
= 4.860 km
Now,  the speed of the motorist travels = 36 km/h
Time taken to covered distance by the motorist = 4.860/36
= 0.135 h
1 hr = 60 x 60 sec
Therefore,  0.135 h = 0.135 x 3600  sec
= 486 sec
1 sec = 1/60 min
Therefore,  486 sec = 486/60
= 8 min 6 sec.
Hence, the answer is (3) 8 min 6 sec.

Anurag Mishra Professor Answered on 19th July 2015.
Add Comment

Your Answer

By posting your answer, you agree to the privacy policy and terms of service.