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 A postal airplane leaves Island A and flies 91 miles to Island B. It drops off and picks up mail and flies 63 miles to Island C. After unloading and loading

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A postal airplane leaves Island A and flies 91 miles to Island B. It drops off and picks up mail and flies 63 miles to Island C. After unloading and loading mail, the plane returns to Island A at an average rate of 300 miles an hour. How many minutes does it take the pilot to travel from Island C to Island A? (Enter your answer as a whole number.)





 Oct 9, 2014

Best Answer 

 #2
avatar+23247 
+5

First, you will need to find the distance from A to C, which is side b.

Since you have a SAS triangle, use the Law of Cosines:

b² = a² + c² -2·a·c·cosB

b² = 63² + 91² -2·63·91·cos153.4

b² = 22502

b  =  150 mi

150 miles at 300 miles per hour  =  1/2 hour

 Oct 9, 2014

2+0 Answers

 #1
avatar+472 
0

You, do 91mi  dived as 63mi then X what you got when you dived with 153.4

 Oct 9, 2014
 #2
avatar+23247 
+5
Best Answer

First, you will need to find the distance from A to C, which is side b.

Since you have a SAS triangle, use the Law of Cosines:

b² = a² + c² -2·a·c·cosB

b² = 63² + 91² -2·63·91·cos153.4

b² = 22502

b  =  150 mi

150 miles at 300 miles per hour  =  1/2 hour

geno3141 Oct 9, 2014

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