The length and breadth of a playground are 80 m and 35 m respectively.
Find the cost of levelling it at 450 per square metre.
(i) How long will a boy take to go three times round the field, if he walks att
round the field, if he walks at rate of 1.5 m per second
?
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Answer:
(i) Permiter of playground= 2×(lenght+breath)
= 2× (80m+35m)
= 2 × 115m
= 230m
Cost of levelling 1m^2= Rs.450
Cost of levelling 2800m^2= Rs.450× 230m
= Rs. 1,03,500
(ii) 3× 230m
= 690m
=690/1.5
= 460 seconds..
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