Find the speed of a boat both upstream and downstream if the speed of the boat in still water is 21mph and the speed of the current is 9mph

For upstream: 12 mph

For downstream: 30 mph

Step-by-step explanation:

Given that the speed of the boat in still water is 21mph and the speed of the current is 9mph

To find the speed of a boat both upstream and downstream,

For upstream, the boat is moving against the direction of the current. The speed will be:

21 - 9 = 12 mph

For downstream, the boat is moving toward the current direction. The two speed will be added together. That is,

21 + 9 = 30 mph

If the direction of the both is perpendicular to the direction of the current, then we will use pythagorean theorem

Speed = sqrt( 21^2 + 9^2 )

Speed = sqrt( 522 )

Speed = 22.85 mph

this story was prepared by jim

mccullaugh in los angeles and

al stewart in new york.

new york the colossal success of "top gun" appears to have dramatically altered madison avenue's

perception of corporate sponsorship

of home video projects.

the paramount home video re- lease, featuring a 60- second diet

pepsi spot, was by no means the

first prerecorded video to carry an advertiser's plug, but it was the

first major theatrical release to do so. in the aftermath of the title's

success, paramount is widely ex- pected to ink a similar deal for

"crocodile dundee" or "star trek

iv" or both.

corporate america's new attraccds push british

recording sales

to 19% gain

london fueled by the compact

disk boom, the value of u.k. manu- facturer shipments of recordings

rose 19% in the 12 -month period ended march 1987, according to the

british phonographic industry.

total value of u.k. shipments for

the period was $755 million for all

configurations. (all value figures

are based on an exchange rate of

$1.68 to the pound sterling.)

cd sales totaled 10.7 million units

worth $121.3 million- compared

with 3.7 million units worth $39.5

million in the prior 12 months -and

accounted for two -thirds of the

overall gain in trade value. at present growth rates, says the bpi, cd

sales for calendar 1987 will reach 20

(continued on page 79)

step-by-step explanation:

amount of oatypop that contains the prize = 40%

amount   of oatypop which doesn't contain the prize = (100-40)=60%

probability that hannah will win a prize

    = s +f s +f f s+ff   f s+ff f f s+ infinity.where f= failure,s= success

=   or 60%

probability that hannah only has to buy 3 or less boxes before getting a prize= (s) and ( f s) and (ff s) and (f f f s)

        = = 87.04 %  

step-by-step explanation: