At noon, a ship leaves a harbor and sails south at 20 knots.  Four hours later, a second ship leaves harbor and sails east at at 10 knots.  When will the ships be 100 nautical miles apart? (1 nautical mile=1knot.)

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter8: Introduction To Functions
Section8.10: Inverse Variation
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At noon, a ship leaves a harbor and sails south at 20 knots.  Four hours later, a second ship leaves harbor and sails east at at 10 knots.  When will the ships be 100 nautical miles apart? (1 nautical mile=1knot.) 

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