exam Maths Puzzle Numerical Ability

Investing: Ms. Jones invested $18,000 in two accounts. One account pays 6% simple interest and the other pays 8%. Her total interest for the year was $1,290. How much did she have in each account.

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exam Other Question

Kwan hiked up a hill at 4km/h and back down at 6km/h. His total hiking time was 3h. How long did the trip up the hill take.
The way I did it I came u with 2h, but the book says 1h Please help me.

I have simplified the equation: 2/5-y/y-2. I got -3y+4/5(y-2). Is it correct? Can it be further simplified?

Thanks