book Maths Puzzle Numerical Ability

Please help me to simplify this problem:

7/10 divided by (-8/10)

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book Other Question

A bicyclist took a ride to the country and it took 5 hours. To get back she went 5mph faster and it took 4 hours. What were the speeds, going and coming? one thousand dollars in a savings account pays 7% interest per year. The interest earned after the first year is added to the account. How much interest is earned on the new principle the following year?

Thanks you very much