exam Maths Puzzle Numerical Ability

Simplify:

12/(x+h+15) minus 12/(x+15) all divided by h

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exam Other Question

Rational Expression:

4/a^2 - 1 + 1/2a + 2 a bus leaves a station at 1 p.m traveling west at an average rate of 44 mile an hour. one hour later a second bus leaves the same station traveling east at a rate of 48 mile an hour. at what time will the two buses be 274 mile apart