book Maths Puzzle Numerical Ability

i need to construct a truth table
my statement is r arrow ~ q

i did work it out myself, i'm not sure how to show you a table..

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book Other Question

Solve for b:

2a+3b=19
5a-2b=0 a motorboat traveled for 2 hours with an 8 km/h current. the return trip against the same current took 3 hours. find the speed of the motorboat in still water.