Asked by Ernie
a motorboat moves 25 miles per hour in still water. it travels 21 miles upstream and 21 miles downstream in a total time of 2.0 hours. whatis the speed of the current?
Answers
Answered by
Steve
time = distance/speed
21/(25+s) + 21/(25-s) = 2
s = 10
check:
21/35 + 21/15 = 2
21/(25+s) + 21/(25-s) = 2
s = 10
check:
21/35 + 21/15 = 2
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