Question

a rectangular field is 92 m by 78 m a man walks round it at the rate of 3 km per hour what time will take in taking 2 rounds

Answer 1

Answer:

Time taken = 12 mins

Step-by-step explanation:

Length of rectangular field = 92 m

Breadth of rectangular field = 78 m

Perimeter of r rectangular field = 2 (92 + 78) m

= 2 (150) m

= 300 m

Distance covered for 2 rounds = 2 (300) m

= 600 m

= 0.6 km

Time taken for 3 km = 1 hr

Time taken for 0.6 km = 0.2 hr = 12 mins

Answer 2

perimeter of rectangle = 2(l+b)

= 2 (92 + 78)

= 2 (170)

= 340 m

3 km in m = 3000 m

1 hour in sec = 60 sec

speed = 3000

3600

speed = 0.83bar m/s or 4/5 m/s

2 rounds = 340 x 2

= 680 m

time taken = distance

speed

= 680 x 5

4

= 850 sec