Posted by jessica on Wednesday, May 29, 2013 at 10:05am.
how do I solve this and show the work:
a motorboat went upstream at 15 miles per hour and returned downstream at 20 miles per hour. How far did the boat travel one way if the round trip took 3.5 hours?

algebra  Steve, Wednesday, May 29, 2013 at 10:16am
since time = distance/speed, add up the total time:
d/15 + d/20 = 3.5
d = 30