Question

The rectangular field is 72m by 58m.keya walks around It at the rate of 3km per hour.how long will she take make 3round​

Answer 1

Answer:

15 minutes and 6 seconds

Step-by-step explanation:

Perimeter of field= 2(l+b)

= 2(72+58)= 2*130= 260 m

Since, she has to make three rounds

It implies that-

Total Distance= 260*3= 780 metres

Speed= 3 km/h= (3*1000)/(60*60) (changing into m/s)

= 3000/3600=5/6 m/s

Since,

Speed= Distance/Time

It implies that,

Time= Distance/Speed

= 780 m / (5/6 m/s)

On calculating,

Time= 936 seconds

= 15 minutes and 36 seconds (Answer)

Answer 2

Answer:

first we will find the distance she will cover when she makes the three rounds

length of one round(perimeter of rectangle)=2(72+58)=2(130)=260m

Total length of three round=3×260=780=780/1000=0.78km

Time to make three round=Distance/Speed=0.78/3=0.26hours=15.6hours