A motorboat travels 567km in 9 hours going upstream and 273km in 3 hours going downstream. What is the speed?
2012 January 10
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Question by lala haha gaga mama: A motorboat travels 567km in 9 hours going upstream and 273km in 3 hours going downstream. What is the speed?
of the boat in still water, and what is the speed of the present.? Please answer this dilemma for me?
Greatest Professional Answer:
Answer by tomman17
91 kmh
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Let the boat speed in still water be b km/hr, and the current speed be c km/hr.
Then:
b – c = 567 / 9 = 63 …(1)
b + c = 273 / 3 = 91 …(2)
Adding (1) & (2):
2b = 154
b = 77
Subtracting (1) from (2):
2c = 28
c = 14
The boat speed was 77km/hr, and the current speed 14km/hr.
Rackbrane is correct.