A boat takes 1 hour longer to go 36 km up a river than
to return. If the river flows at 3 km/hr, find the rate at
which the boat travels in still water.
Answers
Answered by
6
Answer:
5 minutes
Step-by-step explanation:
1hour 36km .36÷12=3 km .1 hour = 60 minutes .60÷12=5 minutes. 3 km = minute
Answered by
68
Answer:
15 km/hr
Step-by-step explanation:
Let x be speed in still water.
To go upstream - Speed is less = x - 3
To come downstream - Speed is more = x + 3
Time to upstream - Time to downstream = 1
36/(x-3) - 36/(x+3) = 1
36(x+3) - 36(x-3)= x² - 9
36x + 108 - 36x + 108 = x² - 9
Therefore, x² = 225
x = 15 km/hr
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