Solve.One conveyor belt can move 1000 boxes in 10 minutes. Another can move 1000 boxes in 12 minutes. If another conveyor belt is added and all three are used, the boxes are moved in 3 minutes. How long would it take the third conveyor belt alone to do the same job?
A. 
min
B. 1
min
C. 
min
D. 6
min
Answer: D
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Find the limit.
A. -? B. ? C. Does not exist D. 1/2
Perform the indicated operation and reduce the answer to lowest terms.
- 
- 
A. 
B. 
C. - 
D. - 
Solve the problem.If the switch is thrown open after the current in an RL circuit has built up to its steady-state value, the decaying current obeys the equation 
How long after the switch is thrown open will it take the current to fall to 
of its original value?
A. -4.60 L/R seconds B. -4.40 L/R seconds C. 1.81 L/R seconds D. 1.61 L/R seconds
Solve the problem.A $170,000 trust is to be invested in bonds paying 7%, CDs paying 5%, and mortgages paying 9%. The bond and CD investment together must equal the mortgage investment. To earn a $12,720 annual income from the investments, how much should the bank invest in bonds?
A. $44,000 B. $41,000 C. $39,000 D. $85,000