<PRE><B>Question 1137355</B>
Emma launches her boat from point A on a bank of a straight river, 3km wide, and wants to reach Point B (8km downstream on the opposite bank) as quickly as possible. 


- Row her boat directly across the river to Point C and then run to B Time = distance / speed. Time AC + time CB = total time
Time taken will be 3/6 + 8/8 = 1.5 hours 


- Row directly to B
 The hypotenuse distance will be {{{sqrt(9+64)}}}
time taken for this distance will be {{{(sqrt(9+64))/6}}}= 1.42 hours


- Row to some point D between C and B, and then run to B

Obviously this will take more time since rowing distance is greater than running distance.

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