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.