Which expression is equivalent to ( 2/5 x + 1 1/5)?

1 answer:

3 0

First you make 1 1/5 an mixed fraction by multiplying 1 times 5 and add one which gives you 6/5 and then you don't add because 2/5 has a variable so you can't combine like terms if you don't have like terms so my answer would be 2/5x + 6/5 but you can wait to answer incase someone else answers incase I'm wrong but just helping :)

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A plane traveled 240 miles. The trip was with the wind. It took 3 hours. The trip back was into the wind. The trip back took 6 h

sveta [45]

Answer:

Plane speed is 60 miles/hour

Wind speed is 20 miles/hour

Step-by-step explanation:

Lets suppose the speed of the plane in still air is s and speed of the wind is w and since speed in the formula below equals speed of the plane plus the wind's speed so speed=s+w for this journey with the wind

$Speed=\frac{Distance}{Time}$

$Distance=Speed*Time$

For the first journey the trip with the wind:

$Distance=Speed*Time\\240=(s+w)(3)\\240/3=s+w\\s+w=80$

Here we got our first equation for the second equation we use the information from the second trip which was into the wind. Which means the speed here would be speed=s-w

$Distance=Speed*Time\\240=(s-w)*6\\240/6=s-w\\s-w=40$