Question

The length of rectangular field is three times it's breadth. A motor car takes 15 mins to complete 5 round at the speed of 12km/hr,find its length.

Answer 1

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Answer 2

Step-by-step explanation:

A motor car takes 15 mins to complete 5 round at the speed of 12km/hr

$speed = \frac{distance}{time} \\ speed \times time \: = distnce \\ 12 \times \frac{1}{4} = distance \\ 3km \: = distance$

5 round = 3km

5 round = 3000 m

1 round = 600m

Perimeter of rectangular field = 600m

2( Length + bredth) = 600m

Let

L= length

B = bredth

Now

2(L+B )= 600

But,

The length of rectangular field is three times it's breadth

L = 3B

2(3B+B)=600

3B+B = 600/2

4B = 300

B = 75

L = 3B

L = 3×75

L= 225

Length of rectangular field is 225 meter

Bredth of rectangular field is 75 meter

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