4. A boat can maintain a constant speed of 34 mph relative to the water. The boat makes a trip upstream to a certain point in 21 minutes; the return trip takes 13 minutes. What is the speed of the current? 5. Trent can deliver his newspapers in 60 minutes. It takes Lois 40 minutes to do the same route. How long would it take them to deliver the newspapers if they work together?
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When the boat is going upstream, it is going against the current, so its effective speed is 34 - x mph. When the boat is going downstream, it is going with the current, so its effective speed is 34 + x mph. We are given that the boat takes 21 minutes to go Show more…
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