exam Maths Puzzle Numerical Ability

32ft/hr= ?yd/day

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The problem is:

Solve the system by using the substitute method. Determine whether the equations are independent, dependent or inconsistent.

Eq 1 states: 3x + 5y = 25
Eq 2 states: x -2y = -10 A River Flowes 3mph. You have a boat that travels 12mph (in still water). How many miles should you travel upstream so that your total trip upstream and back takes 10 HOURS.