# can someone help me solve this using equation

Discussion in 'Pharmacy' started by per protocol, Mar 21, 2007.

1. ### per protocol Junior Member 2+ Year Member

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A boat can travel at 16 mph in still water. If it takes an hour and a half longer to go 45 miles upstream as downstream, what is the speed of the current?

2. ### camjames camjames 5+ Year Member

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speed = distance/time
let x = speed of the current
t = time taken for the boat to go downstream

upstream: (16 mph - x ) = (45miles)/( t + 1.5hrs)
downstream: (16 mph + x) = (45miles)/(t)

t = (45miles)/(16 mph +x)
so...
(16mph -x) = (45 miles)/([45miles/[16mph +x]] + 1.5 hrs)

so with an equation with one variable missing x = 4 mph.

3. ### sdn1977 Senior Member 10+ Year Member

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So...it seems as though you post each of your questions twice.

I'd have to agree w/ Apollyon in All Students - the forum is not the place to do your homework or that of your kids.

Didn't you take physics or math??? I think if you go back to the chapter, you'll find it.

You know the saying....give a man a fish, you feed him for a day...teach him to fish............

or....maybe go back to All Students since this has nothing to do with a drug - oh, unless the boat is carrying illegal drugs

4. ### Farmercyst From the shadows PharmacistModerator Emeritus 10+ Year Member

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What class is this???

Trial and error comes up with rate of 4 mph (12 upstream and 20 downstream)

Too bad someone already did the equation for you. Only took 4 trials and 3 errors.

Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
5. ### Da Alchemist 2+ Year Member

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are u in pharm program already? or pharmacist? this is easy algebra.

6. ### MountainPharmD custodiunt illud simplex 10+ Year Member

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Wow o wow this forum is exciting. I was anticipating the rush of "can someone help with with this kinetics question" at the start of the year. But its March and now we are asking "can someone help me with this 5th grade algebra problem?" Nice.....

7. ### Requiem Senior Member Moderator Emeritus 10+ Year Member

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Kinetics really isn't that much different from 5th grade algebra to be honest.

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