exam Maths Puzzle Numerical Ability

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1.) 4+5-9=

2.) 26-(-9)-6=

3.) 5-5-5=

4.) -4-4+(-15)= The excursion boat on the river takes 2� hours to make the trip to a point 12 miles upstream and to return. If the rate at which the boat travels in still water is 5 times the rate of the river current, what is the rate of the current?