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Where to Land

Stage: 4 Challenge Level: Challenge Level:1

Chris is swimming in a lake, 50m from the shore.
Her family are 100m along the shore.

 
                                     


She'd like to get back to her family as quickly as possible. If she can swim at 3 m/sec and run at 7m/sec, how far along the shore should she land in order to get back as quickly as possible?