Subject: General Aptitude · Chapter: Area · Exam: 2007 · Marks: · Difficulty:
Area of a square natural lake is 50 sq. kms. A diver wishing to cross the lake diagonally, will have to swim a distance of
(a)10 miles
(b)12 miles
(c)15 miles
(d)None of these
Answer
Answer (as printed): D
Explanation
Let the length of the diagonal be $x \mathrm{km}$. Then, $\frac{1}{2} x^{2}=50 \Rightarrow x^{2}=100 \Rightarrow x=\sqrt{100}=10 \mathrm{km}$ $$=\left(\frac{10}{1.6}\right) \text { miles }=6.25 \text { miles }[\because 1 \text { mile }=1.609 \mathrm{km}]$$