exam Maths Puzzle Numerical Ability

48. Vinegar has a hydronium-ion concentration of 1.26 x 10^-3 mole per liter. determine the pH of vinegar and state whether it is an acid or base.

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Mark drove 250 miles to visit Sandra. Returning by a shorten route, he found that the trip was only 225 miles, but traffic slowed his speed by 5 miles. If the two trips took exactly the same time, what was his rate on the return trip?