Friday

April 18, 2014

April 18, 2014

Posted by **Anonymous** on Saturday, January 21, 2012 at 4:06am.

- algebra -
**Reiny**, Saturday, January 21, 2012 at 9:36amRate of A = 60 nails / 20 sec = 3 nails/sec

rate of B = 50 nails / 10 sec = 5 nails/sec

combined rate = 8 nails/sec

time at combined rate = 400/8 seconds

= 50 seconds

**Related Questions**

finance - A machine cost $ 4,000. It lasts 2 years and has no scrap value (that ...

math1 - (ii) A factory has two machines. Past records show that the first ...

statistics - A machine produces 49 titanium bolts every 2 hours. At this rate ...

algebra - Sara bought some 6-penny nails and some 10-penny nails at ace hardware...

math - jay corp. bought machine for 15000. machine is expected to produce 10000...

math 141 - Three machines turn out all the products in a factory, with the first...

accounting - Jay Corp. bought a machine for $15,000. The machine is expected to ...

Math - A factory has 3 machines that produce the same item. Machines 1 and 2 ...

Chemistry - Typically, there is a scale provided for weighing the nails. For ...

math - Jay Corp. bought a machine for $15,000. The machine is expected to ...