Question

4. A rectangular field is 72 m by 58 m. A girl walks round it at the rate of 3 km per hour. What time will she take
walking 2 rounds? ​

Answer 1

Answer:

Perimeter of field =2 (72m + 58 m)

=260m

Speed of girl = 3km/h=3000m/h

Time taken for 1 round = 260/3000h=26/300*60 min =26/5 min

2 rotation = 26*2/5=52/5=10.5 min

Step-by-step explanation:

Answer 2

Step-by-step explanation:

In rectangular field

Length = 72m

Bredth = 58m

Perimeter of rectangle = round of rectangular field

Perimeter of rectangle = 2(Length +Bredth)

=2(72 + 58)

= 2(130)

= 2×130

Perimeter of rectangle = 260m

She walks 3 km/hr

i.e. 3000m per 60 minutes

She takes time to walk 260m =. 260/3000 ×60

She takes time to walk 260m = 5.2 minutes

260m = 1 round = 5.2 minutes

520 m = 2 round = 10.4 minutes

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