book Maths Puzzle Numerical Ability

TWO NUMBERS HAVE A DIFFERENCE OF TEN AND THE SUM OF THIRTY-FOUR, WHAT ARE THE NUMBERS?

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book Other Question

2 investments made produce an annual income of $4200.amount invested at 14% is $6000 less tha amount invested at 10%. find amount invested at 14% A cyclist bikes x distance at 10 miles per hour and returns over the same path at 8 miles per hour. What is the cyclist’s average rate for the round trip in miles per hour?
I got 9.0 but the answer is 8.9