exam Maths Puzzle Numerical Ability

f(x)=5x-1

f(x-h)-f(x)
___________
h

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Can you please help me solve the problem...instructions...a principal of $5000 was invested in a savings account for 4 years...if the interest earned for the period was $400, what was the interest rate? A bus leaves a station at 1P.M. traveling west at an average rate of 44 mi/h. One hour later a second bus leaves the same station, traveling east at a rate of 48 mi/h. At what time will the two buses be 274 miles apart?