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Please let me know if you need any clarification. I'm always happy to answer your questions.
Let the time taken by Jake be 't' hours
So the time taken by Elwood = t+3 hours
85t + 90 (t+3) = 970
85t+90t+270 = 970
175t = 970-270
175t = 700
t= 700/175
= 4
so time taken by Elwood = 4+3 = 7hours
Please let me know if you have any questions and best me if you are satisfactory.
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