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

Find all the values of x from the following equation:

30/2x+1 minus 8/x-1 + 2=0 Hello,

I need help with a few problems i cant seem to work out for homework.

1:Solve for x: 9^x=3
2:Solve for x: 2^9x^-4=32
3:Solve for x: log10^7=log10x-log10^2

Thanks