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**GAdams** Fred cycled from home to his friends house and back again.

The distance is 20km.

On his way home, he cycled x km per hour.

On his way back, his speed decreased by 2km per hour.

It took him 4 hours altogether to cycle to his friends house and back.

1. Write down an equation for x

x = (20/4) - 2 ?

2. Show that the equation can be written as x^2 - 12x + 10 = 0

3. Solve the equation in question 2 to 1 decimal place

4. Only one of teh answers in question 3 can be Freds speed. Explain why.