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A is 10 miles west of B. C is 30 miles north of B. D is 20 miles east of C. What is the distance from A to D ?
Answer & Solution
Correct Answer:
Option
E
$$\eqalign{
& {\text{Required distance :}} \cr
& AD = \sqrt {{{\left( {AE} \right)}^2} + {{\left( {DE} \right)}^2}} \cr
& = \sqrt {{{\left( {30} \right)}^2} + {{\left( {30} \right)}^2}} \cr
& = \sqrt {900 + 900} \cr
& = \sqrt {1800} \cr
& = 30\sqrt 2 {\text{ miles}} \cr} $$
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