# Some Algebra Problems...!!!

Please check attached file. And when you send your solutions, please use Microsoft word, doc. format for attachment.

Problem #1.

Telephoto lens. Please Use this formula:

1/f = 1/o + 1/i

Problem # 2.

Upstream, downstream. Junior's boat will go 15 miles per

hour in still water. If he can go 12 miles downstream in the

same amount of time as it takes to go 9 miles upstream,

then what is the speed of the current?

Problem #3.

Big plane. A six-passenger plane cruises at 180 mph in

calm air. If the plane flies 7 miles with the wind in the

same amount of time as it flies 5 miles against the wind,

then what is the wind speed?

Problem # 4.

Filling a tank. A water tank has an inlet pipe and a drain

pipe. A full tank can be emptied in 30 minutes if the drain

is opened and an empty tank can be filled in 45 minutes

with the inlet pipe opened. If both pipes are accidentally

opened when the tank is full, then how long will it take to

empty the tank?

https://brainmass.com/math/basic-algebra/some-algebra-problems-256171

#### Solution Summary

All the answers are given complete step by step. Grab the solution and enjoy the learning.