exam Maths Puzzle Numerical Ability

The excursion boat on the river takes 2½ 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?

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exam Other Question
what are the roman numerals? Has this been done correctly? -1/2 - (-5/8) = -1/2 + (+5/8) = 4/6 = 2/3 Fractions really confuse me and this real number sutracting is just as bad!!!Thanks so much for your time and help.