Given a 40 gallon natural gas water heater, and a shower head with a flow rate of 2.5 gallons per minute. How long should the shower be able to maintain 105°F water temperature?

Assume the average cold water supply temperature is 58.7°F. The tank will be set at 140°F, to avoid Legionella. The tank recovery is typical of a natural gas heater, so it can recover its volume in an hour (40 gph in this case).


Question: What to keep in mind when copying a small card game?
Answer: As commenters have pointed out, the copying that you are describing is illegal in most countries.

This isn't legal advice (and it depends on where you're located), but a quick Google search about copying and protecting card games seems to suggest that you probably can make a copy if you don't directly copy the artwork or wording used in the original game. It sounds like you can write out the rules in your own words, and make your own cards. Of course, some would say this is ethically questionable. And who knows what the issues are if the game mechanics are patented in some way.


  (Don't worry, of course I'll mail a fit donation to the manufacturers.)


There's a better way. If the game is out of print, but the manufacturers are still contactable, why not just write to them? You can avoid the issue of illegal copyright infringement if you have permission. 

Something like "I am really interested in a copy of this game. Is it possible to buy it from you still? Are you likely to reprint it anytime soon? If not, would you mind if I photocopied my friends copy and mailed you $70?"