Question

The length and breadth of a playground are 80 m and 35 m respectively
(1) Find the cost of levelling it at 4.50 per square metre.
(2) How long will a boy take to go three times round the field, if he walks at rate of 1.5 m per second?​

Answer 1

Answer:

area of playground = length × breadth = 80×35= 2800 sq.m

cost of levelling 1 sq.m = ₹4.5

cost of levelling 2800 sq m = 2800×4.5= ₹12600 perimeter of ground =2(l+ b ) = 2(80+35)= 230

so distance = 230m speed =1.5 m/ s

time = distance /speed = 230 /1.5 = 153 sec

Answer 2

Answer:

my second id

now it's given that the cost of levelling is 4.50 per m². = 14175 rupees.