Solving Applied Problems: Two Equations?

Solve. 1.) Radio Airplay. Rudy must play 12 commercials during his 1-hr radio show. Each commercial is either 30 seconds or 60 seconds long. If the total commercial time during the hour is 10 minutes, how many commercials of each type does Rudy play? 2.) Etch Clean Graphics uses one cleanser that is 25% acid... show more Solve.

1.) Radio Airplay. Rudy must play 12 commercials during his 1-hr radio show. Each commercial is either 30 seconds or 60 seconds long. If the total commercial time during the hour is 10 minutes, how many commercials of each type does Rudy play?

2.) Etch Clean Graphics uses one cleanser that is 25% acid and a second that is 50% acid. How many liters of each should be mixed to get 10 L of a solution that is 40% acid?

3.) Darren paddled for 4 hr with a 6-km/h current to reach a campsite. The return trip against the same current took 10 hr. Find the speed of Darren's canoe in still water.
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