Carol walks 12 km at x km/h and then a further 6 km at (x-1) km/h. The total time taken is 5 hours.
(i) write an equation in terms of x and show that it simplifies to 5x^2-23x+12=0
(ii) factorise -5x^2-23x+12=0
(iii) solve the equation 5x^2-23x+12=0
(iv) write down carols walking speed during the final 6 km
224
417
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