length is 80 and breadth is 35 how long will a boy take to go three times round the field if he walked at rate of 1.5 metre per second
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First take perimeter of field.
P = 2(L+B)
= 2 × 80 + 35
= 2 × 115
= 230 m
He has to travel 3 rounds; 230 × 3 = 690m (This is the total distance he has to travel.)
We know, Speed = Distance/Time
= 1.5 = 690/T
T = 690/1.5 = 460 sec.
He will take 460 sec. to cover the field 3 times.
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