book Maths Puzzle Numerical Ability

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.

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book Other Question

When solving a linear inequality, do you always need to solve for y? using sum, difference, half, or double angle formulas and the exact value chart in the solution, find the exact value of cos 105 degrees.