book Maths Puzzle Numerical Ability

Sally traveled in a boat up the river, against its 1 km/h current and back again in 55 minutes. She traveled 5 km in each direction. What is the boat's rate in still water?

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book Other Question

A county council has 15 seats on its county council which are apportioned among four regions. The population of the west region is 3560 and west region holds 4 seats on the council [[4 -3]x-[[-1 1]=[[4 6]
[6 -2]] [5 7]] [8 2]]

Wrong question earlier...sorry.