Math, asked by lightersncandies, 11 months ago

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 seema5989
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 ankurbadani84
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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