A boat's crew rowed 7.5 miles downstream, with the current, in 1.5 hours. the return trip upstream, against the current, covered the same distance, but took 2.5 hours. find the crew's average rowing velocity in still water and the average velocity of the current.

Average rowing velocity of boat in still water is 4 miles per hour and average velocity of the current is 1 mile per hour.

Step-by-step explanation:

We are given the following in the question:

Let x be the average rowing velocity of boat in still water and y be the the average velocity of the current.

The boat rowed 7.5 miles downstream, with the current, in 1.5 hours.

Velocity with the current =

Thus, we can write the equation:

The return trip upstream, against the current, covered the same distance, but took 2.5 hours.

Velocity against the current =

Thus, we can write the equation:

Solving, the two equations:

Thus, average rowing velocity of boat in still water is 4 miles per hour and average velocity of the current is 1 mile per hour.

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step-by-step explanation:

maybe try   if it is work from a book, if not try

the smallest possible measurement of the width is 14 feet

step-by-step explanation:

let's assume length of parallelogram is 'l'

width of parallelogram is 'w'

the perimeter of a parallelogram must be no less than 40 feet

so, we get

we are given

length of parallelogram is 6 feet

so,

l=6

we can plug it

now, we can solve for w

subtract both sides by 12

divide both sides by 2

and we get

so,

the smallest possible measurement of the width is 14 feet