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Reptile [31]
3 years ago
10

It takes a boat going upstream 11 hours to cover the same distance as it would cover in 9 hours going downstream. What is the sp

eed of the boat if the speed of the current is 2 kilometers per hour?
Mathematics
1 answer:
Musya8 [376]3 years ago
7 0

Answer:

  20 km/h

Step-by-step explanation:

Let b represent the speed of the boat in km/h. Then the distance covered is ...

  distance = speed × time

  (b -2)(11) = (b +2)(9)

  11b -22 = 9b +18 . . eliminate parentheses

  2b = 40 . . . . . . . . add 22-9b

  b = 20 . . . . . . . . . divide by 2

The speed of the boat is 20 km/h.

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