NIFT UG 2018 Question Paper with solutions

Question : 29 of 150

Marks: +1, -0

The area of a square park is ₹ 25 sq km. The time taken to complete a round the field once, at a speed of

3 {km} \/ {h}

Solution:

Area of square park

=(\;\text " Side "\;)^{2}

⇒ \;\; 25=(\;\text " Side "\;)^{2}

\Rightarrow

Side of park

=5 {km}

Now, perimeter of square park

=4 ×

Side

=4 × 5=20 {km}

Time taken to complete a round of park

=\;{\;\text " Distance (Perimeter) "\;}/{\;\text " Speed "\;}=\;{20}/{3} {h}

=6 \;{2}/{3} {h}=6+\;{2}/{3} × 60 {min}

=6 {h} 40 {min}

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