book Maths Puzzle Numerical Ability

Mr X spent 2.5 hrs biking up a mountain. Rested for 30 minutes. Biked down in 1.5 hrs. How far did Mr. X bike, if his rate of ascent was 3 km/hr less than his rate of decent?

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book Other Question

Irma invested some money a 7% and $100 less than that at 8%. Her total interest was $58. How muc did she invest at 7%, rounded to the nearest dollar? functions
how do I solve this problem
y = x+5
the answer is......

y is equivalent to the sum of a constant c and x, where c = 5