Question

the length and breath of a play ground are 80 m. and 35 m.respectively? How long will a boy take to go three times round the field it he walks at rate of 1.5 m. persecond.

Answer 1

153.3333334 sec
it is very easy to get the ans
just find the perimeter and divide it by 1.5

Answer 2

Given that length of a playground l = 80m.

Given that breadth of a playground b = 35m.

We know that perimeter of the playground = 2(l + b)

                                                                         = 2(80 + 35)

                                                                         = 2(115)

                                                                         = 230m.


Since the boy took 3 times rounds, the distance covered = 3 * 230

                                                                                                 = 690m.

Given that speed of walking = 1.5 m/s.

We know that Speed = Distance/Time.

                        Time = Distance/Speed

                                  = 690/1.5

                                  = 460sec

                                  = 7.66 minutes.



Hope this helps!