A motorboat travels 162 km in 3 hours going upstream and 780 km in 8 hours going downstream. What is the speed of the boat in still water, and what is the speed of the current?
I do not need to know how to do it exactly just the answer...
2007-02-20 17:29:07 · 3 answers · asked by jenni_sox 1 in Science & Mathematics ➔ Mathematics
~If you don't want to know how to do it, I'm not interested in doing it for you and giving you the answer. Guess it's time to get off the computer and to go do your homework, eh?
2007-02-20 17:37:52 · answer #1 · answered by Oscar Himpflewitz 7 · 1⤊ 0⤋
if the speed of the boat is u and the speed of the current is v then
u - v = 162/3 = 54....................(1)
and u + v = 780/8 = 97.5.........(2)
equation (2) - equation (1) gives us
2v = 43.5
therefore v = 21.75 km/hr
the speed of the current is = 21.75 km/hour
Hope this was helpful.
2007-02-20 17:40:58 · answer #2 · answered by rhapsody 4 · 0⤊ 0⤋
MOTORBOAT DOWN THE STREAM M RL M RLY M RLY M RLY LIFE IS BUT A DREAM
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Check
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2007-02-20 17:37:18 · answer #3 · answered by Anonymous · 1⤊ 0⤋