book Maths Puzzle Numerical Ability

Please help me solve this problem for a: 6/15x4/a a=

What I have tried: 24/15a=8/5a

Thank you, KAyla

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John ran at a slow pace for 5 hours. The return trip took him only 2 hours because he rode a bike and his speed was 6 miles per hour larger thean his running speed. John's speed wh I am having some difficulty with this problem...
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List all of the potential rational zeros of the polynomial function.Do not attempt to find the zeros. f(x)