Algebra 2?? please help!

Posted on 2015-11-30 07:14:00 in Math by GEORGE

1. Henry can clean a pool 3 times as fast as john. Together, they can clean a pool in 2 hours. Which equation can be used to find the number of hours, t, it takes henry to clean the pool alone?
A. 3/t+3/2t=1
B. 1/t+1/2t=3
C.1/t+1/3t=2
D. 2/t+2/3t=1

2. Henry can clean the pool 3 times as fast as john. Together they can do it in 2 hours. About how long would it take henry to clean the pool alone?
A.0.5 hours
B. 2.7 hours
C. 1.5 Hours
D. 8.0 Hours

3. It takes company A 20 hours to upgrade a home with a heat pump. It takes 12 hours if company A and Company B work together. How long will it take company B to install the heat pump?
A. 20
B.10
C. 30
D. 16

4. Amy can build a skateboard ramp 4 times faster than melanie. TOgether they can do the job in 2 hours. how long will it take melanie working alone to build the ramp?
A. 2 hr
B. 2.5 hr
C. 20 hr
D. 4 hr

5. It takes 8 hours for ben to build a fence. It takes bonny and ben 5 hrs together to build a fence. Which equation can be used to find the number of hours, x, for bonny to build the fence?
A. 5/8+5/x=1
B. 5/x+5/8x=1
C. 8/5x+8/x=1
D. 8/5+8/x=1

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