Mathematics 75 Online
OpenStudy (my4babiesandme):

During the first part of a trip, a canoeist travels 39 miles at a certain speed. The canoeist travels 19 miles on the second part of the trip at a speed 5 mph slower. The total time for the trip is 3 hrs. What was the speed on each part of the trip? round to nearest hundredth

OpenStudy (anonymous):

21.28 and 16.28

OpenStudy (my4babiesandme):

can you explain to me how you came to that I am trying to learn this before my test next week?

OpenStudy (anonymous):

okay, so you know the formula speed=distance/time?? let the first speed be x, and the second speed be x-5. you know the whole time taken was 3 hours, so find the first time as 39/x, and the second time as 19/(x-5). then you make an equation by adding them and equating it to 3. solve it, and you get two answers, one is 21 something, and 3 something. with 3, x-5 would be negative, so x=21 (something) okay??

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