What does a equal a=l

Mathematics

1 answer:

Akimi4 [234]4 years ago

7 0

It says right there in your question a=l. So, a=l.

Now we have concluded that a=l. a equals l.

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A boat traveled in a river upstream for a distance of 30 miles at a constant rate, r, in miles per hour, and then made the retur

ICE Princess25 [194]

Answer:

Step-by-step explanation:

r = boat's rate

c = current's rate

1. A boat traveled in a river upstream for a distance of 30 miles. Travelling upstream, the current obstructs the movement, so the actual boat's rate is r - c mph.

If the boat took 4 hours to travel upstream, then

$\dfrac{30}{r-c}=4\\ \\4(r-c)=30\\ \\4r-4c=30$

2. A boat traveled in a river downstream for a distance of 30 miles. Travelling downstream, the current helps the movement, so the actual boat's rate is r + c mph.

If the boat took 3 hours to travel downstream, then

$\dfrac{30}{r+c}=3\\ \\30=3(r+c)\\ \\3r+3c=30$