book Maths Puzzle Numerical Ability

i'm not sure if this is the right category i im learning primeter and i am not sure what im doing here's an example of 1 of my problems i just need to no how it gets worked out the

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Would someone please help me figure this out?
A boat traveled 36 miles downstream with the current, in 1.5 hours. The return trip upstream, against the current covered the same di There is the square ABCD. Trace a line between corner A and midpoint E of side DC. Trace another line between corner A and point F of side DC such that AF equals AB+FC. Prove that angle DAE is half of angle FAB.