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I am Lyosha [343]
3 years ago
6

A motorboat, that has speed of 10 km hour in still water, left a pier traveling against the current of the river. Forty-five min

utes after the boat left the pier, the motor of the boat broke, and the boat began drifting with the current. After three hours of drifting with the current, the boat was back at the pier where it had started. What is the speed of the current of the river?
Mathematics
1 answer:
Leokris [45]3 years ago
4 0

9514 1404 393

Answer:

  2 km/h

Step-by-step explanation:

  distance = speed × time

The boat's progress upriver can be modeled by ...

  (10 -c)(3/4) +(0 -c)(3) = 0

  7.5 -3.75c = 0 . . . . simplify

  2 -c = 0 . . . . . . . . . divide by 3.75

  c = 2 . . . . . . add c

The speed of the current is 2 km per hour.

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Comment on the answer choice:

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<h3>How much has Tara in her bank account now?</h3>

Here we need to perform some additions and subtractions. We know that Tara starts with $350 in her account.

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1. In triangle ABC, if AB = 3cm, BC = 4cm and AC = 5cm Find
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Step-by-step explanation:

A) The diagram of the triangle is shown in the attached photo

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