exam Maths Puzzle Numerical Ability

another problem..

If a bus traveled 10 km/h faster, it would take 2h less time to make a 315km trip. What is its speed?

Thanks!

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exam Other Question

That's okay, my teacher found out that she had given us the upper class' problem. Thanks for trying, but this is the real problem:

Decision makers in many fields, including busi My experiment is to find the maximum number of pieces a pie can produce depending on the amount of cuts sliced into one. With one cut the pie produced 2 pieces, with 2 cuts the pie