Help me with vectors

A man who swims at 2m/s relative to the water sets out at right angles to the bank of a river 12m wide. the river is flowing at 1.5m/s so that it carries him downstream as he swims.
a) How long would the crossing take in a still water.
b) How long does the crossing take in moving water. Explain.
c) how far downstream does he land?
what is his speed relative to the bank?
Asked Sep 28, 2013

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