exam Maths Puzzle Numerical Ability

Working together, Carla and Elise can cut and split a cord of wood in 4 hours. Working alone, Carla takes 6 hours more than Elise. How long would it take ELise to do this job alone?

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0.5= The number of people who catch a cold t weeks after January1 is:
5t-3t squared+t cubed. The number of people who recover t weeks after January 1 is: t - t squared + 1/3t cubed.