exam Maths Puzzle Numerical Ability

I would greatly appreciate if someone could show me how to answer these problems. Thanks
-troubled student

*A boy can row a boat at a constant rate of 5 mi/hr in still water.

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exam Other Question
at a benefit concet, 600 tickets were sold and $1500 was raised. if there were $2 and $5 tickets, how many of each were sold? find the distance betweem (-6,10) and (3,-2)