Question

A rectangular field is 72 m by 58 m. Keya walks around it at the rate of 3 km per hour
How long will she take to make 3 rounds?​

Answer 1

Answer:

Length of one round =2(72+58) = 260m

total length of three rounds = 3(260) = 780m = 0.78 km

Time to make three rounds =

speed

distance

=

3

0.78

15.6min

Answer 2

0.26 hours ( 15.6 minutes) she will take to make 3 rounds

Step-by-step explanation:

GIVEN

Length = 72 m

Breadth = 58 m

Speed = 3 km/h

___________________________

TO FIND

How long will she take to make 3 rounds

___________________________

We know that,

Perimeter Of Rectangle = 2 × ( Length + Breadth )

Perimeter Of Rectangle = 2 × ( 72 + 58 )

Perimeter Of Rectangle = 2 × 130

Perimeter Of Rectangle = 260

Perimeter Of Rectangle = 260 m

___________________________

We know that,

Speed = Distance / Time

Here,

Speed = 3 km

Distance = 260 × 3 = 780 m = 0.78 km

We know that,

Time = Distance / Speed

Time = 0.78 / 3

Time = 0.26

Time = 0.26 hours

0.26 hours ( 15.6 minutes) she will take to make 3 rounds