So....I think we've established that 740 feet in 25 miles is either "nothing to sneeze at" or "not very demanding." We're always helpful!
Maybe depends on what you're used to? Might be helpful to contact the ride leader in advance and get him/her to compare the terrain to something in the neighborhoods where you are used to riding.
Here in Seattle, 740 feet of climbing in 25 miles would be considered "mostly flat." (My daily commute, over some typical Seattle terrain, is 1800 feet of climbing in 10 miles, each way. It's a very good workout if I try to do it quickly, nothing remarkable if I take it easy.)