Question

the length of a rectangular plot of ground is 5 times its breadth and its area is 5 ha how long will a man take to walk around it at the rate of 1.5 km/hr

Answer 1

Answer:

Step-by-step explanation:

topic :

• perimeter

given :

• the length of a rectangular plot of ground is 5 times its breadth and its area is 5 ha how long will a man take to walk around it at the rate of 1.5 km/hr

to find :

• how long will a man take to walk around it at the rate of 1.5 km/hr

solution :

• Given area of fied = 5 times

• Length = 5 m

• Breadth = 5/5 = 1 cm

• Now Perimeter of field = 2[1+b]
• = 2(5 +1)
• = 2(6) = 12 m

• for 5 rounds perimeter = 6×5 = 30 m

• Given speed of boy = 1.5 km/hr = 1.5 ×5/18 = 15/16

• then time taken to cover 30 m distance = 30/5×3

• Time = 12 × 3sec

• Time = 12 ×3/60 = 0.6

answer :

• 0.6 min required to complete 5 rounds of field.

Answer 2

Answer 48 minutes


Given Area=5 ha=50000 sq.meter

Length=5* breadth
l*b=50000
5*b*b=50000
b*b=10000
b=100 m
l=500 m

Perimeter =2(l+b)=2(100+500)=1200 m=1.2 km

Rate 1.5 km/ 1 hour

1.5 km in 1 hour

1.5km in 60 minute

1km in 40 minute

Therefore for 1.2 km it takes 48 minutes