Question

The area of a square field is 900m how much time willa girl tale to run 10 times around it at the rate of 6 km/h​

Answer 1

Answer:

The time taken by the girl to complete 10 rounds is 320 minutes or 5 hrs 20 minutes

Step-by-step explanation:

Given area of square field = 900 $m^{2}$

         the side of the field = $a^{2}$ = 900 $m^{2}$

                                            a× a = 30 m  × 30 m

                                  there for a = 30 m

        perimeter of the field = 4a ( a =side of the field )

                                            = 4 × 30

                                             =120 m is the distance covered by girl in 1 round

         the distance covered in 10 rounds = 10 ×120 m= 1200 m

          the speed rate of the girl = 6 km/h

       [ to convert km/h to m/s we multiply the given number by 5/18]

             the speed rate of the girl = 6× 5/18 = 30/ 18 m/s

           time taken by the girl to run 10 rounds is

              t = distance ÷ speed rate

             time = 1200 ÷ 30/18

                      = 1200/ 3.75

                      = 320 minutes = 5 hours 20 minutes