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January 28, 2015

January 28, 2015

Posted by **dan** on Thursday, October 1, 2009 at 8:40pm.

i did

200x+300x = 7200

500x=7200

x=14.4mins?

- math -
**Reiny**, Thursday, October 1, 2009 at 9:22pmrate of newer machine =7200/200 can/min

= 36 cans/min

rate of older machine = 7200/300 cans/min

= 24 cans/min

so combined rate = 36+24 = 60 cans/min

so time for combined work = 7200/60 = 120 minutes.

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