Question

the length and breadth of a playground are 80 m and 35 M respectively find the cost of levelling it at rupees 4.50 per sq.m how long will a boy to go three times round the field if he walks at rate of 1.5 m per second

Answer 1

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Answer 2

Answer:

cost= RS.12600

time= 460 sec

Step-by-step explanation:

l= 80m

b =35m

area = l*b

area = 80*35

       = 2800 m sq.

cost for levelling = 2800*4.50 = Rs. 12600

perimeter = 2(l+b)

                = 2(80+35)

                = 2*115

                = 230 m

distance the boy walks in three round = 230*3 = 690 m

t = distance/speed

t= 690/1.5

t= 6900/15

t= 460 sec

therefore will walk for 460 seconds