Question: We can use a simple equation r= W t where we have r as the combined work rate and we know W - the hours

We can use a simple equation r= W t where we have r as the combined work rate and we know W - the hours needed to prepare the biscuits. John 500 biscuits/2hours=250 biscuits per hour Lorna 450 biscuits/3 hours=150 bulb/hour John and Lorna together in one hours 250+150 =400 biscuits So we have: 400 1500 1 t 400 1500 1 *1t= 1 *It 400t=1500 t= 1500 15 400 4 t = 3 4 hours

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