the length and breadth of a playground are 80 m and 35 m respectively. (1)find thr cost of levelling it at rs. 4.50 per sq meter (2) how long will a boy take to go three times round the field, if he walks at rate of 1.5 per second?
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area=80×35
=2800sq.m
cost of levelling=2800×.50
Rs12600
perimeter for for finding how long it will take for the boy to cover 3rounds
2(l+b)
2(80+35)
=230m
3rounds =230×3
690m÷1.5
=460secs
=2800sq.m
cost of levelling=2800×.50
Rs12600
perimeter for for finding how long it will take for the boy to cover 3rounds
2(l+b)
2(80+35)
=230m
3rounds =230×3
690m÷1.5
=460secs
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