Question

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 ​

Answer 1

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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