what do you plan on using the outlets for?
As others have noted, this is the critical question. In the USA, a 240V receptacle is normally only installed for high wattage applications where a 120V circuit is no longer practical. You can push almost twice as many watts over a given cable gauge at 240V, after all.
So, normally speaking, whenever you see a 240V circuit it was designed and installed for a particular application, and the wiring sized for it. Thus, unless for some strange reason they oversized the circuit or you can guarantee that both appliances aren't going to be used at the same time, you'll probably end up running a new circuit.
For example, an electric water heater is normally set up for 30 amps - because in normal use it takes around 25. Same with an electric dryer. Both shouldn't exist on the same circuit unless you like breakers popping or you have some way to make sure the water heater and dryer don't operate simultaneously.