Question

5. A rectangular field is 90 m by 70 m. A man walks around it at the rate of 4k
per hour. What time will he take in making 5 rounds ?
6. Find the perimeter of the rectangle whose length is 70 cm and breadth is 30​

Answer 1

Step-by-step explanation:

5. Perimeter of field = 2(l+b)

= 2(90+70)

= 2*160

= 320m

the man walks 4 km per hour.

The men walks 4000m per hour

time taken to walk 1000m = 1/4000 hour

Taking five rounds = 320*5

= 1600 m

time taken to walk 5 rounds = 1600*1/4000

= 1600/4000

= 16/40

= 2/5 hour

6. Perimeter of rectangle = 2(l+b)

= 2(70+30)

= 2*100

= 200 cm

Hope it helps.