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|dw:1432783836686:dw|
S = san juan
B = barbados
M = middle point of the journey

hint: 1 knot = 1 nautical mile per hour

600*15=9000 nautical miles?

is that right? or am I misinterpreting?

distance = unknown
speed = 15 knots
time = 10 hours
distance = speed * time

OHHH ok so then it would be 150

yeah so the distance from S to M is 150 nautical miles
|dw:1432784489817:dw|

what we need is the distance from M to B. We can find that by using the law of cosines

|dw:1432784585295:dw|

c^2 = a^2 + b^2 - 2ab*cos(C)
c^2 = 600^2 +150^2 - 2*600*150*cos(20)
...
...
...
c = ??

okay gimme a sec to calculate

I got about 555.92

that's too large

you need to be in degree mode

I changed it to degree mode and it's still pretty big, I got about 461.90

better
|dw:1432785182237:dw|

then you'll use the law of sines to find angle SMB
|dw:1432785226747:dw|

so sinA/a=sinB/b=SinC/c right?

yes you'll use that

S=20 degrees
B=
M=
s=461.90402
b=150
m=600

@jim_thompson5910 are those the right values?