Fred cycled from home to his friend's house and back again. The distance between their houes is 20km. On his way to his firend's house, Fred cycled at x km/h. On the back, Fred cycled 2 km/h slower. It took Fred 4 Hours altogether to cycle to his friends house and back.
a) write down an equation for x
b) show that the equation can be written as x2 - 12x + 10 = 0
really appreciate the help its driving me crazy!