Practice SHORT ANSWER
So, the problem you are given to solve here is:
You and a group of friends are going on a kayaking trip on a river. You
will travel 4 miles upstream against the current, take a break for half
an hour, and travel 4 miles downstream with the current. Your group's
average kayaking speed without a current is 2.4 miles per hour.
Your group decides to kayak on a river that has a current with a speed
of 0.8 mile per hour. Based on this information, how many hours will
your trip take, including the half an hour break?

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.

n=1.75+1.75

step-by-step explanation:

3.5/2=1.75